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Re: [APML] Orion Short Tube 80
> Does anyone on the list use the Orion Short Tube 80 for AP?
I have a Celestron 102mm Wide Angle. It is very similar to the 80mmm version, but seems more robust and have better details. By the way, the Celestron 80WF, the Orion ST80, Skywatcher and a lot of other telescopes are the same. All made by Synta (China).
You can see pictures made with a Celestron 80WF at:
The homepage of Victor Ramirez.
> Any problems with vignetting on a 35mm frame?
Yes, there are some problems. I think that the built-in adapter isn't the better option, couse it has a internal diameter of only 1.25" (external 2"). I am thinking on buying (or making) a 2" T-adapter (The focuser is the same for all the wide angle telescope models).
Other problem (as someaone else said) is the focal lenth. It is a little far away the maximum when using T-adapters and you'll need extension tubes. With the built-in adapter you don't have that problem, but it is nearly the limit...
> As an achromat would I need a minus violet filter for film?
It would be a good choise. When using E200 the chromatic aberration isn't very noticeable, but if you want optimal results, the MV filter is what you need (or shoot H-alpha...).
Regards,
Carlos Milovic F.
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