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  1. #1
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    Default Astro-tech 6inch imaging Newt or Astro-tech 6inch Ritchey-Chretien



    I am looking to upgrade from the Celestron C6N optical tube that came with the AVX mount, mainly the focuser. Wanted to get some broad thoughts from folks on what to choose. Couple things i am definitely set on are - getting an open tube telescope and not exceeding the 6 inch range (6inch seems to be perfect balance of aperture and portability in my opinion).

    I was going to just get a new focuser but noticed i can get a full tube with good focuser for not much more and possibly better for imaging. I was close to getting the AT6IN, but also saw the AT6RC and was intrigued. I hear that RC scopes are really great for astrophotgraphy but couple things concerned me:
    1- The RC is f/9 which i understand is not great for imaging time-- is there any reason this would not also be true for an RC scope?
    2- a large obstruction is present in the RC design which can impact true aperture, should this really not be a factor?


    Also i know the f/4 newt will need a coma corrector... will the RC need a flattener?

    Thanks for your thoughts....
    Celestron AVX mount,C6N and TPO 6" imaging newt, Zhumell 10" Dob, Meade ETX 80 refractor, Bushnell Legacy 10x50 binos, variety of eyepieces from explore scientific, GSO, Meade, and Zhumell. Canon T3i, Orion Magnificent Mini AutoGuider Package

  2. #2
    gatorfishin's Avatar
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    Default Re: Astro-tech 6inch imaging Newt or Astro-tech 6inch Ritchey-Chretien

    does anyone have thoughts about the above? anyone have the AT6RC?
    Celestron AVX mount,C6N and TPO 6" imaging newt, Zhumell 10" Dob, Meade ETX 80 refractor, Bushnell Legacy 10x50 binos, variety of eyepieces from explore scientific, GSO, Meade, and Zhumell. Canon T3i, Orion Magnificent Mini AutoGuider Package

  3. #3
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    Default Re: Astro-tech 6inch imaging Newt or Astro-tech 6inch Ritchey-Chretien

    I don't have a RC but I do have a newt. Of your choices above, both have benefits and drawbacks. The newt is faster, ideal for AP but does require a coma corrector and occasional collimation. The RC design is supposed to have a true flat field but at f/9 it will require a reducer and collimation is supposedly a lot harder but is required less often. Both have their purposes in AP and both are suited to different applications. I hope that helps, it is not a lot but it is more than you had.
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    Default Re: Astro-tech 6inch imaging Newt or Astro-tech 6inch Ritchey-Chretien

    As to the RC's longer focal length, when shooting digital, which i assume you are, the longer focal length is not nearly as big a handicap as when dealing with film. I've had both and imaged with both (not the AT newt, but a meade 6" f/5). You can get very good results from either as is, although my guess is that the newt would benefit more from the coma corrector than the RC would from the reducer. I think the newt would probably be more versatile for AP and visual, whereas the RC is definitely aimed at the imager.

 

 

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