Re: Pics from 8" APO v. lowly SCTs
- From: "RMOLLISE" <rmollise@xxxxxxxxxxx>
- Date: 15 Jul 2005 14:43:09 -0700
hooskerdoo wrote:
> Why would even a C14 be able to produce shots so superior to what
> should be a superlative performer? I don't believe it's all size
> either. Some C11 pics are much better as well. A shot claimed to be
> from a C9.25, from a link posted in this group, is much better too.
>
> So, why?
>
>
Why, you ask?
Well, part of it _is_ the aperture...
I've done quite a bit of planetary imaging over the last 41 years
(ouch), and for the last three years all of it has been with webcams or
similar devices (aka, the Meade LPI). I've been able to do some very
good work on Jupiter with a C8. Likewise, when Mars was very bright
during the last opposition, there was no incentive to drag out a larger
aperture SCT. The C8 was doing everything I wanted to do. Even with a
webcam, seeing still matters--just not as much. Using the smaller
aperture scope seemed to give me an edge when the seeing was so-so.
_However_, I found and find that with dimmer objects--Saturn, Mars when
away from opposition, etc.--aperture helps in that MORE LIGHT is a big
advantage. Even with a webcam, MORE LIGHT translates to less noise. It
also allows me to bump up the focal length/image scale to the point
where I can really let a webcam do its high resolution thing.
Another reason is seeing...
As above, seeing is still the limiting factor if you want to image the
Moon and planets. If you live in an area with punk seeing, you won't
achieve the high resolution images of your dreams no matter what you
do. Oh, a webcam will do much better than the old-fashioned methods,
but if you live on the slope of the Rocky Mountains you still won't be
getting images like Ed Grafton does down in Houson.
But probably the most important thing is who's doing the imaging...
Oh, and one other very important thing. The skill of the man or woman
behind the eyepiece is still much more important than the pedigree of
the scope. ;-)
Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
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- From: hooskerdoo
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