I have come to like the "red-dot" reflex type finders in the last dozen years or so, but still use a 50mm finder and sometimes up to 80mm when finding objects manually. When I finally finish my 17.5" Newt, it will have not only those, but either a 5" or 6" short-focus auxilliary scope as well. I'll only use a 30mm or 40mm finderscope on my smallest of refractors. Funny to see a 40mm finder on a 48mm f/20 refractor, lol! Dave Bennett turned me on to the old Apogee "Mars-eye" red-dot sight over a decade ago. It is switchable between red and green dots. Too cool, wish I had another. Out of production, AFAIK. I also use the Rigel Systems Quickfinder. I prefer it to the Telrad, which, even though it works well, is just way too huge on smaller scopes. I bought the pulsing accessory for it some years ago and it is a worthwhile addition. A pulsing reticle allows fainter stars to be seen through the optical window. YMMV. Stay in this hobby long enough, and you end up with one of everything. More stuff for the kid to sell on eBay when I'm gone. What optical finders do you use regularly? (Let's ignore GoTo for this discussion.)
When I use a finder, I use a Telrad. I have a 8" f4.7 Newt, and I think having the large telrad at the end of the tube actually helps--I see significantly better out of one eye than the other, so I can put my head against the tube and be able to see the finder--the finderscope that came with the unit can sometimes be tricky for me to see through… Now I have to see if I can make a blinky circuit for it--never thought of that. Dan On Feb 11, 2012, at 1:30 PM, Chuck Hards wrote:
I have come to like the "red-dot" reflex type finders in the last dozen years or so, but still use a 50mm finder and sometimes up to 80mm when finding objects manually. When I finally finish my 17.5" Newt, it will have not only those, but either a 5" or 6" short-focus auxilliary scope as well.
I'll only use a 30mm or 40mm finderscope on my smallest of refractors. Funny to see a 40mm finder on a 48mm f/20 refractor, lol!
Dave Bennett turned me on to the old Apogee "Mars-eye" red-dot sight over a decade ago. It is switchable between red and green dots. Too cool, wish I had another. Out of production, AFAIK.
I also use the Rigel Systems Quickfinder. I prefer it to the Telrad, which, even though it works well, is just way too huge on smaller scopes. I bought the pulsing accessory for it some years ago and it is a worthwhile addition. A pulsing reticle allows fainter stars to be seen through the optical window. YMMV.
Stay in this hobby long enough, and you end up with one of everything. More stuff for the kid to sell on eBay when I'm gone.
What optical finders do you use regularly? (Let's ignore GoTo for this discussion.) _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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On Sat, Feb 11, 2012 at 3:47 PM, Daniel Holmes <danielh@holmesonics.com>wrote:
When I use a finder, I use a Telrad. I have a 8" f4.7 Newt, and I think having the large telrad at the end of the tube actually helps--I see significantly better out of one eye than the other, so I can put my head against the tube and be able to see the finder--the finderscope that came with the unit can sometimes be tricky for me to see through…
Now I have to see if I can make a blinky circuit for it--never thought of that.
One HUGE problem I've noticed is that MOST Newtonian manufacturers install their finder scopes for left-eye dominant users. Stupid, since most people are right-eye dominant. I've always made my own scopes to accomodate my dominant eye. Seems it's not even a consideration among telescope makers, but makes a huge difference.
Your dominant eye should be the one closest to the main tube, when using a straight-through finder. If it's not, you're scope is probably a "leftie", in a right-hand world. If you are left-eye dominant and you lucked-out, congratulations! The blinky circuit for the Telrad was available through Rigel Systems, IIRC... though it's been a LONG time and I could be wrong. I love mine. I bought it at the same time I got my Pulseguide, back in the days of hand-guiding.
Fun fact…my dominance changes depending if I have glasses or contacts in. I have wildly varying amounts of correction between my two eyes, which means not only do I have no depth perception, but that I get to always freak out a new eye doctor. With glasses or nothing, I'm left-eye dominant. With contacts, I'm right eye. It takes about 20 minutes from when I put the contacts in for the dominance to shift--and near late afternoon, I can actually feel my left eye trying to re-assert itself, especially when reading. Used to give me horrible headaches, and the world seemed to tilt for me while things were shifting, but for the last 7-10 years I've been able to cope with it. When I go to get my eyes tested, if they are testing for dominance & depth perception I always get to prove the shifting dominance to a new doctor. Which to bring things back on topic, I have to always think about what I'm observing, and figure out if I want glasses or contacts. My contacts used to dry out when looking for long periods though an eyepiece, but my doctor has given me a new brand that seem to do pretty good. I also have to request no coatings on my glasses, the difference in magnification between the two cause issues with refraction near the lens edges--coatings seem to exaggerate the issue for me…it's bad enough with the fishbowl effect only happening in one eye, I don't need more. Dan On Feb 11, 2012, at 4:27 PM, Chuck Hards wrote:
On Sat, Feb 11, 2012 at 3:47 PM, Daniel Holmes <danielh@holmesonics.com>wrote:
When I use a finder, I use a Telrad. I have a 8" f4.7 Newt, and I think having the large telrad at the end of the tube actually helps--I see significantly better out of one eye than the other, so I can put my head against the tube and be able to see the finder--the finderscope that came with the unit can sometimes be tricky for me to see through…
Now I have to see if I can make a blinky circuit for it--never thought of that.
One HUGE problem I've noticed is that MOST Newtonian manufacturers install their finder scopes for left-eye dominant users. Stupid, since most people are right-eye dominant. I've always made my own scopes to accomodate my dominant eye. Seems it's not even a consideration among telescope makers, but makes a huge difference.
Your dominant eye should be the one closest to the main tube, when using a straight-through finder. If it's not, you're scope is probably a "leftie", in a right-hand world. If you are left-eye dominant and you lucked-out, congratulations!
The blinky circuit for the Telrad was available through Rigel Systems, IIRC... though it's been a LONG time and I could be wrong. I love mine. I bought it at the same time I got my Pulseguide, back in the days of hand-guiding. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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You shouldn't be seeing a difference in magnification with coatings, assuming you're referring to anti-reflection coatings. You shouldn't experience more than a fraction of a wavelength of difference, which isn't enough for the brain to be concerned with. I suspect childhood trauma. ;-) You'll get used to a difference in close-focus between eyes, probably around age 45-50. My eyes differ by about 14", but the brain can cope with that, given time. At least, mine did. My daugher laughs at me as I move books closer, then further away, as I search for a good middle-ground, even with non-prescription readers on. I have mild astigmatism in both eyes, but even in my dominant right-eye, which I do most of my observing with, it's not enough to cause poor imagery at the eyepiece. I remove my glasses at the eyepiece and use the focuser to accommodate. As long as my astigmatism doesn't get much worse, I see tack-sharp images. Knock-on-wood. When I can't detect Saturn's polar hood in my "planet killer", I'll know it's time for lasik. Crap.
It's not the coatings affecting the magnification--it's the effect the coatings seem to have on the refraction off the center of my right lens--they have different refraction indexes because of their thickness and magnification changes (I didn't notice it much when I wore the awesome huge glasses of the late 80's/early 90's, but now that my wife made me stylish, I see it more, since the sweet spot is smaller)--so when I look through something with only one eye and compare to the other, the positions of anything off center appear to change more than they really are. Probably not making sense--I'll bring my glasses to L&O and let you see for yourself... Dan On Feb 11, 2012, at 5:49 PM, Chuck Hards wrote:
You shouldn't be seeing a difference in magnification with coatings, assuming you're referring to anti-reflection coatings. You shouldn't experience more than a fraction of a wavelength of difference, which isn't enough for the brain to be concerned with. I suspect childhood trauma. ;-)
You'll get used to a difference in close-focus between eyes, probably around age 45-50. My eyes differ by about 14", but the brain can cope with that, given time. At least, mine did. My daugher laughs at me as I move books closer, then further away, as I search for a good middle-ground, even with non-prescription readers on.
I have mild astigmatism in both eyes, but even in my dominant right-eye, which I do most of my observing with, it's not enough to cause poor imagery at the eyepiece. I remove my glasses at the eyepiece and use the focuser to accommodate. As long as my astigmatism doesn't get much worse, I see tack-sharp images. Knock-on-wood.
When I can't detect Saturn's polar hood in my "planet killer", I'll know it's time for lasik. Crap. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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On Sat, Feb 11, 2012 at 9:54 PM, Daniel Holmes <danielh@holmesonics.com>wrote:
It's not the coatings affecting the magnification--it's the effect the coatings seem to have on the refraction off the center of my right lens--they have different refraction indexes because of their thickness and magnification changes (I didn't notice it much when I wore the awesome huge glasses of the late 80's/early 90's, but now that my wife made me stylish, I see it more, since the sweet spot is smaller)--so when I look through something with only one eye and compare to the other, the positions of anything off center appear to change more than they really are.
Probably not making sense--I'll bring my glasses to L&O and let you see for yourself...
OK, I think I get it now. You must have a very large prescription difference between eyes.
I know what you mean about the current eyeglass selection. Lenses have gotten tiny in the last few years. I use progressive bifocals and like the line as low as possible, so just my dashboard is in focus at the bottom while the greater portion of my FOV is focused out the windsheild. I use prescription sunglasses setup the same way.
In my own case, it was the nuns at Catholic school. (shudder...) ;-) On Sat, Feb 11, 2012 at 10:28 PM, Larry Holmes <larry@kijoda.com> wrote:
Yeah, Chuck, I used to beat on him like a drum, but then he grew, and grew, and grew. TeeHee. 73, Larry
On 2/11/2012 5:49 PM, Chuck Hards wrote:
I suspect childhood trauma. ;-)
For those that use a magnifying finder, do you prefer standard, straight-through invertend images, or right-angle, correct-image? I split on this one. For Newts, I use a straight-through finder. I use the "two eyes open" method and superimpose the x-hairs and finder image on the same spot in the sky, seen with my other eye simultaneously. On refractors, I tend to prefer a right-angle finder, though have no preference between mirror reversed and correct image. I own both. I guess when you've been at this long enough, you learn to use most every method.
Right angle, correct image. However sometimes it drives me wild switching back and forth between moving my dob while looking through the correct image finder and then back to the inverted newtonian view. Ya know what I mean? Mat -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Sunday, February 12, 2012 11:57 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] What finderscope do you use? For those that use a magnifying finder, do you prefer standard, straight-through invertend images, or right-angle, correct-image? I split on this one. For Newts, I use a straight-through finder. I use the "two eyes open" method and superimpose the x-hairs and finder image on the same spot in the sky, seen with my other eye simultaneously. On refractors, I tend to prefer a right-angle finder, though have no preference between mirror reversed and correct image. I own both. I guess when you've been at this long enough, you learn to use most every method. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options". ---------------------------------------------------------------------------- This message and any included attachments are from Siemens Medical Solutions and are intended only for the addressee(s). The information contained herein may include trade secrets or privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail with a copy to Central.SecurityOffice.Healthcare@siemens.com Thank you
On Sun, Feb 12, 2012 at 6:31 PM, Hutchings, Mat (H USA) < mat.hutchings@siemens.com> wrote:
Right angle, correct image. However sometimes it drives me wild switching back and forth between moving my dob while looking through the correct image finder and then back to the inverted newtonian view. Ya know what I mean?
Yes I do. But it will pass, with time. It will become intuitive, the more you use it.
It's been 10 years, still drives me wild... How much longer do I need to wait??!! I guess I'm just thicker than most. :) Mat -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Sunday, February 12, 2012 8:34 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] What finderscope do you use? On Sun, Feb 12, 2012 at 6:31 PM, Hutchings, Mat (H USA) < mat.hutchings@siemens.com> wrote:
Right angle, correct image. However sometimes it drives me wild switching back and forth between moving my dob while looking through the correct image finder and then back to the inverted newtonian view. Ya know what I mean?
Yes I do. But it will pass, with time. It will become intuitive, the more you use it. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options". ---------------------------------------------------------------------------- This message and any included attachments are from Siemens Medical Solutions and are intended only for the addressee(s). The information contained herein may include trade secrets or privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail with a copy to Central.SecurityOffice.Healthcare@siemens.com Thank you
On Sun, Feb 12, 2012 at 6:39 PM, Hutchings, Mat (H USA) < mat.hutchings@siemens.com> wrote:
It's been 10 years, still drives me wild...
How much longer do I need to wait??!! I guess I'm just thicker than most. :)
LOL! Not thicker, but perhaps more fastidious. Whatever works for you. Keep the faith!
I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds.
Please, go to http://fallenstarhunters.blogspot.com/ and look at the top right corner, follow the link and make a report! Thanks! -Barrett -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Brent Watson Sent: Tuesday, February 14, 2012 6:01 PM To: Utah Astronomy Subject: [Utah-astronomy] Green Flash I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".
This was not a fireball nor meteor. It was the sun's light refracting through the earth's atmosphere just as it sets. ________________________________ From: Barrett <BarrettWF@comcast.net> To: 'Utah Astronomy' <utah-astronomy@mailman.xmission.com> Sent: Tuesday, February 14, 2012 6:09 PM Subject: Re: [Utah-astronomy] Green Flash Please, go to http://fallenstarhunters.blogspot.com/ and look at the top right corner, follow the link and make a report! Thanks! -Barrett -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Brent Watson Sent: Tuesday, February 14, 2012 6:01 PM To: Utah Astronomy Subject: [Utah-astronomy] Green Flash I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options". _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".
Anyone and everyone who may have seen this- PLEASE go to http://fallenstarhunters.blogspot.com/ At the top right hand corner you will see a link to report it. PLEASE DO THIS! Thanks! Barrett www.fallenstarhunters.com http://fallenstarhunters.blogspot.com/ -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Brent Watson Sent: Tuesday, February 14, 2012 6:01 PM To: Utah Astronomy Subject: [Utah-astronomy] Green Flash I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".
On Tue, Feb 14, 2012 at 6:01 PM, Brent Watson <brentjwatson@yahoo.com>wrote:
I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds. _______________________________________________
Brent, was this over the GSL? A water horizon?
It was over the Great Salt Lake in that the lake waas betwen me and the horizon. The actual horizon was the mountains west of Grantsville. I believe it is the Stansbury Range. ________________________________ From: Chuck Hards <chuck.hards@gmail.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, February 14, 2012 8:07 PM Subject: Re: [Utah-astronomy] Green Flash On Tue, Feb 14, 2012 at 6:01 PM, Brent Watson <brentjwatson@yahoo.com>wrote:
I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds. _______________________________________________
Brent, was this over the GSL? A water horizon? _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".
This is actually not all that unusual. I see some sort of green flash on about 30% of the sunsets I see. This one was diferent because of the brilliant green and the length of time it was visible. ________________________________ From: Chuck Hards <chuck.hards@gmail.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, February 14, 2012 8:07 PM Subject: Re: [Utah-astronomy] Green Flash On Tue, Feb 14, 2012 at 6:01 PM, Brent Watson <brentjwatson@yahoo.com>wrote:
I just saw a beautiful, emerald green flash at sunset. This was one of the more vibrant green flashes I have ever witnessed. It lasted several seconds. _______________________________________________
Brent, was this over the GSL? A water horizon? _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".
I use the Rigel QuickFinder. I find that the pulsing setting (included with the QuickFinder) helps a lot. Fletch
When I use a finder, I use a Telrad. I have a 8" f4.7 Newt, and I think having the large telrad at the end of the tube actually helps--I see significantly better out of one eye than the other, so I can put my head against the tube and be able to see the finder--the finderscope that came with the unit can sometimes be tricky for me to see through
Now I have to see if I can make a blinky circuit for it--never thought of that.
Dan
On Feb 11, 2012, at 1:30 PM, Chuck Hards wrote:
I have come to like the "red-dot" reflex type finders in the last dozen years or so, but still use a 50mm finder and sometimes up to 80mm when finding objects manually. When I finally finish my 17.5" Newt, it will have not only those, but either a 5" or 6" short-focus auxilliary scope as well.
I'll only use a 30mm or 40mm finderscope on my smallest of refractors. Funny to see a 40mm finder on a 48mm f/20 refractor, lol!
Dave Bennett turned me on to the old Apogee "Mars-eye" red-dot sight over a decade ago. It is switchable between red and green dots. Too cool, wish I had another. Out of production, AFAIK.
I also use the Rigel Systems Quickfinder. I prefer it to the Telrad, which, even though it works well, is just way too huge on smaller scopes. I bought the pulsing accessory for it some years ago and it is a worthwhile addition. A pulsing reticle allows fainter stars to be seen through the optical window. YMMV.
Stay in this hobby long enough, and you end up with one of everything. More stuff for the kid to sell on eBay when I'm gone.
What optical finders do you use regularly? (Let's ignore GoTo for this discussion.) _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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-- Daniel Holmes, danielh@holmesonics.com "Laugh while you can, monkey boy!" -- Lord John Whorfin
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The Rigel Quickfinder is on all my scopes. I also use a 70mm f4 refractor I made from a lens out of a copy machine on my 16" dob. However, that finder is very heavy and I, just yesterday, finished a 50mm finder I made from a cruddy pair of 10X50 binos. That will replace my 70mm as soon as next week (weather permitting). Mat -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Saturday, February 11, 2012 3:30 PM To: Utah Astronomy Subject: [Utah-astronomy] What finderscope do you use? I have come to like the "red-dot" reflex type finders in the last dozen years or so, but still use a 50mm finder and sometimes up to 80mm when finding objects manually. When I finally finish my 17.5" Newt, it will have not only those, but either a 5" or 6" short-focus auxilliary scope as well. I'll only use a 30mm or 40mm finderscope on my smallest of refractors. Funny to see a 40mm finder on a 48mm f/20 refractor, lol! Dave Bennett turned me on to the old Apogee "Mars-eye" red-dot sight over a decade ago. It is switchable between red and green dots. Too cool, wish I had another. Out of production, AFAIK. I also use the Rigel Systems Quickfinder. I prefer it to the Telrad, which, even though it works well, is just way too huge on smaller scopes. I bought the pulsing accessory for it some years ago and it is a worthwhile addition. A pulsing reticle allows fainter stars to be seen through the optical window. YMMV. Stay in this hobby long enough, and you end up with one of everything. More stuff for the kid to sell on eBay when I'm gone. What optical finders do you use regularly? (Let's ignore GoTo for this discussion.) _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options". ---------------------------------------------------------------------------- This message and any included attachments are from Siemens Medical Solutions and are intended only for the addressee(s). The information contained herein may include trade secrets or privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail with a copy to Central.SecurityOffice.Healthcare@siemens.com Thank you
On Sun, Feb 12, 2012 at 6:25 PM, Hutchings, Mat (H USA) < mat.hutchings@siemens.com> wrote:
The Rigel Quickfinder is on all my scopes. I also use a 70mm f4 refractor I made from a lens out of a copy machine on my 16" dob. However, that finder is very heavy and I, just yesterday, finished a 50mm finder I made from a cruddy pair of 10X50 binos. That will replace my 70mm as soon as next week (weather permitting).
Mat, you've discovered that "copy lens" scopes, while working perfectly, tend to be heavy. Blame the triplet design, and massive hounsings.
I have some 70mm bino objectives available, if you would like one. Nice, lightweight doublets. No heavy housing. Typically plastic. I have a 70mm home-made finder of 320mm focal lenghth. It's a weird doublet lens, unknown provenance, not a bino objective. I got it from Apogee (not the camera/mount company) some ten or fifteen years ago. But the imagery is excellent for such a short lens. I use it with a 32mm 2" illuminated x-hair eyepiece, yielding about 10X, with a 2" diagonal.
So as a follow up to this thread, I did get my 50mm finder up and running for last Friday's observing run. It worked great, and my scope was able to loose at least 10 pounds of counter-weight on the mirror box as a result. I also made a much improved alignment set up by using two pieces of angle aluminum to fashion a simple alt/az adjustment. This is way superior to the twin ring apparatus I used on the 70mm finder. Very happy with this "new" finder. Cost was $0.00! Mat -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Sunday, February 12, 2012 8:33 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] What finderscope do you use? On Sun, Feb 12, 2012 at 6:25 PM, Hutchings, Mat (H USA) < mat.hutchings@siemens.com> wrote:
The Rigel Quickfinder is on all my scopes. I also use a 70mm f4 refractor I made from a lens out of a copy machine on my 16" dob. However, that finder is very heavy and I, just yesterday, finished a 50mm finder I made from a cruddy pair of 10X50 binos. That will replace my 70mm as soon as next week (weather permitting).
Mat, you've discovered that "copy lens" scopes, while working perfectly, tend to be heavy. Blame the triplet design, and massive hounsings.
I have some 70mm bino objectives available, if you would like one. Nice, lightweight doublets. No heavy housing. Typically plastic. I have a 70mm home-made finder of 320mm focal lenghth. It's a weird doublet lens, unknown provenance, not a bino objective. I got it from Apogee (not the camera/mount company) some ten or fifteen years ago. But the imagery is excellent for such a short lens. I use it with a 32mm 2" illuminated x-hair eyepiece, yielding about 10X, with a 2" diagonal. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options". ---------------------------------------------------------------------------- This message and any included attachments are from Siemens Healthcare and are intended only for the addressee(s). The information contained herein may include trade secrets or privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail with a copy to Central.SecurityOffice.Healthcare@siemens.com Thank you
participants (7)
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Barrett -
Brent Watson -
Chuck Hards -
Daniel Holmes -
Fletcher Gross -
Hutchings, Mat (H USA) -
Larry Holmes