Re: Telescopes for astrophotography
- From: Llanzlan Klazmon <Klazmon@xxxxxxxxxxxxxxxx>
- Date: 18 Aug 2005 14:25:33 +1200
"Timothy Stark" <fsword7_nospam@xxxxxxxxxxx> wrote in
news:3pudneioitaSfp7eRVn-oQ@xxxxxxxxxxx:
> Hello folks,
>
> I was shopping for new telescopes for astrophotography for planets,
> moon, and deep sky. I looked at some Celestron/Meade telescopes. Does
> anyone have any experiences with Celestron S-GT and CPC and Meade LX90
> and LX200GPS? I am considering Celestron C8S-GT or C925S-GT. Which
> telescopes can handle long-expurose with my Nikon D70 for deep sky?
>
> I recently read astronomy magazines and noticed that Newt and SCT are
> best for astrophotography. Well, I forget to tell something about Newt.
> Can Newt handle long-expourse for deep sky?
The issue with long exposure is to do with the mount and tracking system
rather than the type of Telescope. The main issue with a Newt is that they
are often optimised for visual use - i.e they have a much smaller secondary
mirror than the comparable SCT. This is great for visual contrast but means
that the size of the fully illuminated field is quite small (not an issue
with imaging planets of course). I would guess that for astrophotography
with a Newt you would ideally use a bigger secondary mirror than is usual
for visual work. Another factor is that Newt's generally dont have much
focus travel compared an SCT, so it might take a bit of fiddling around to
get the Newt to focus at the right position for your camera's sensor or
film. Much depends on the specific type of astrophotography you are doing.
Probably the most versatile type of scope as far as astrophotography goes
is an APO refractor but a big aperture in one of those is also BIG $$$$.
Klazmon.
>
> Thanks!
> Tim
>
>
>
.
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- Telescopes for astrophotography
- From: Timothy Stark
- Telescopes for astrophotography
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