Dave Dunn wrote:

I think that next year I will try making a 20" f/10. I plan to fold the
optics and view from the ground. I am researching this year to see how
I can
correct for Astigmatism and Coma because I would like to put the
secondary
off axis.

Dave

I would be very interested in what you come up with. Please let us know, I would love to do the same type of thing if I know what I was doing.

Jim

 David Dunn <david.dunn@albertsons.com> wrote:

I think that next year I will try making a 20" f/10. I plan to fold the
optics and view from the ground. I am researching this year to see how I can
correct for Astigmatism and Coma because I would like to put the secondary
off axis. So far I think I will have the 20" ground to f/10. I will use a
10" secondary and f/8 and bring the light back down to a diagonal to put the
light in my eyepiece.

Dave

-----Original Message-----
From: Brent Watson [mailto:brentjwatson@yahoo.com]
Sent: Friday, February 21, 2003 11:06 AM
To: utah-astronomy@mailman.xmission.com
Subject: Re: [Utah-astronomy] Mirrors


My 22 inch is f6.3. Only a couple of folks have
required oxygen.

Brent

--- Greg Taylor wrote:
> Imagine a 30" f/7...
>
> "Pass me that pressure suit willya?"
>
> "Sure thing; oh, and watch out for those satellites,
> they come a little close. By the way, did you
> remember
> your parachute?"
>
> "Naw, I'd just burn up if I fell anyhow..."
>
> Cave made some sweet mirrors, so I've been told.
> You
> can probably get some nice high power views with it
> too.
>
> Agreeing with what Chuck said, my 10 f/5.6 does a
> better job than it would if it were f/4.5, being
> mass
> produced and all. On a rare night of perfect seeing
> last summer (very far from here), I was able to push
> it to 580x without image degradation. I saw detail
> on
> Uranus! (Boy that dob driver comes in handy at those
> high magnifications)
>
>
> --- David L Bennett wrote:
> > Don't forget considerations of field of view! My
> > 10" f/5 Cave with a
> > 40mm Tele Vue Wide Field gives some very
> impressive
> > Milky Way shots ;)
> >
> > On Friday, February 21, 2003, at 09:58 AM, Chuck
> > Hards wrote:
> >
> > > Everyone should, unless there is a specific
> reason
> > for
> > > going "short". Of course, legitimate reasons
> > include
> > > transportation and ergonomics.
> > >
> > > Brent's always been right-on in that department!
> > :)
> > >
> > > C.
> >
> >
> > _______________________________________________
> > Utah-Astronomy mailing list
> > Utah-Astronomy@mailman.xmission.com
> >
>
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>
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