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  1. #1
    Celestron's Avatar
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    Default Astro-Tech AT90EDT vs. Astro-Tech AT8RC w/ reducer/field flattener



    Just wondering . . . it's for Astrophotography, as you may have guessed. Now you Refractor freaks, (and Non-Refractor) Will probably say right away the Refractor, but i'd like the RC's Aperture for Galaxies, BUT, The Aperture is traded for Focal Length which is a startling f/8 . . . which, in return, will be awful for nebula. Lookin' for opinions . . (as usual )
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  2. #2
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    Hi celestron . My 8in. f10 shmitty is an awesome machine for nebulas .. I havent used my 5in refractor a whole lot so i cant compare them ..Oh yea ..Focal length and focal ratio are two different things ....
    16in Night sky
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  3. #3
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    Default

    whoops . . . focal RATIO
    hey, also you must need a super wide eyepiece with f/10 . . . what are you using???
    P.S. hey trevorw, i know you have one of those 8" RC's . . . defend your scope!!! (in other words, post a post)
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    when i first got the scope i bought some series 5000 plossls with a 60 degree field ..
    16in Night sky
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    Default

    Wow! alright, i suppose it's okay for viewing, but, do you use eyepieces for astrophotography? I've heard that sometimes people do, but also, some don't . . . get me straight here . . .
    Last edited by Celestron; 05-15-2009 at 12:07 AM.
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    I havent gotten to astrophotography yet ... When i do i plan on using a flip mirror system instead of an eyepiece projection ...
    16in Night sky
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  7. #7
    Celestron's Avatar
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    ahhh . . .
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    Default

    Celestron,

    There are some great links to look over regarding astrophotography work. Trevor can help you a great deal there, as well.

    The RC is primarily an AP scope used for "Prime Focus" imaging, meaning the camera is connected directly to the focuser by means of focal adaptors, and as a result the camera uses the aperture and focal length of the scope as it's "lens".

    There is some AP work done that is "Afocal", meaning the camera lens is mounted (or held) to take an image of the view in the eyepiece. I'm sure you can do that with the RC, but Prime Focus would be far better.

    If you are looking for a viewing scope that you can also use for AP work, then the AT90ED would be your best choice. That scope would also fit well on a smaller mount than the RC would require. With the AT90 you could do either type of AP work, but also have some great optics for viewing (although the difference in aperture is substantial).

    BTW, if you've seen some of Trevor's images, most of those (till he got his RC) were taken with an 80mm ED scope, I believe. Trevor?

    Just my thoughts...

    Mike
    Last edited by DizzyGazer; 05-15-2009 at 01:05 AM.

 

 

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