Sean;
Astrophotography is the hardest thing I've attempted since I tried to
repair the clutch on my Comet Cyclone, in the winter, laying in snow.
I've been using a Meade 8" LX-200 basically as a guidable mount for
various lenses. The normal and wide lenses are easy and can take
interesting photos. But the telephotos are a bear. Out of probably a
few dozen tries in the last year or two (it's hard for me to get to dark
sky now that we've got our little baby), I've gotten 2 useable slides.
One of the area surrounding the Whirlpool Galaxy with my 250/2 which is
now someone elses'. The Whirlpool could be recognized - under a loupe.
The other of the ubiquitous Orion Nebula with the 350/2.8 (I bought with
the proceeds from the 250/2) plus a 1.4x, making a 500/4 This was tough
to guide, but it produced a wonderful slide on EK200.
I look forward to seeing your successes!
George
Sean Chan wrote:
>
> > Catadioptric scopes (those with a corrector lens at the front) are made
> > in two optical designs... either Maksutov or Schmidt-Cassegrain. The
> > Maksutov corrector plate is a very thick meniscus lens with the
> > secondary mirror being an aluminzed spot on the back of the corrector
> > plate. The Maksutov design is used for mirror camera lenses, spotting
> > scopes and astronomical telescopes. The corrector plate gets heavy and
> > hard to manufacture as the aperture goes up. The Questar 7-inch
> > telescope may be the largest commercially available Maksutov design.
> >
> > The Schmidt corrector plate appears to be a flat piece of glass with the
> > secondary mirror mechanically mounted via holes drilled in the middle.
>
> Vixen makes a telescope VISAC (Vixen's 6th Order Aspherical Catadiptric)
> which has a Ritchey-Cretion (spelling??) design. This scope boasts
> pinpoint sharp stars (0.35 micron or 35 micron??) till the edge of 35mm
> film. I bought this scope 3 years ago.
>
> This scope also lead me to the purchase of my first Olympus OM-1 last
> year which now my Oly system has grown to an OM-4Ti plus a few lenses.
> Although I've yet to come up with an astrophotograph with my gear, you
> lot will be the first to know and see when I do :-).
>
> Sean
> --
> Sean H.Y. Chan ICQ# 28162308 sean@xxxxxxxxxx
> IT Consultant http://www.tsm.com.au/~sean
> DSM Group Pty. Ltd. +61 (0)500-888-117 (W)
> PO Box 1493, West Perth, 6872, WESTERN AUSTRALIA
>
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