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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-- Daniel Holmes, danielh@holmesonics.com "Laugh while you can, monkey boy!" -- Lord John Whorfin