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Thread: Questions about focal reducer and filters/t-adapter...

  1. #21
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    Default Re: Questions about focal reducer and filters/t-adapter...



    Since you pay attention to detail, for that Newt you will want a field flattener or coma corrector. Unfortunately, from messages on this board, nobody was able to figure out how to attach one because the focuser attaches directly to the camera's T ring not the T adapter. That scope is a great way to get started while saving money for something better but your 6SE with focal reducer may be a better starting point. Great picture by the way!
    ... Henk. Telescopes: 6" Mak-Newt (Comet Hunter), ES ED127CF, ES ED80, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: Losmandy G11S, AVX, LXD55, Tiltall, Cameras: Fuji X-a1, Canon SX40, Xt, XSi, T6, ELPH 100HS, DIY: Dob and camera barndoor trackers, afocal adapter, Dob with foldable base and Az/Alt setting circles, Accessories: SSAG, Plossls, Barlows, Telrad, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK

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  2. #22
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    Default Re: Questions about focal reducer and filters/t-adapter...

    Quote Originally Posted by CamelHat View Post
    Since you pay attention to detail, for that Newt you will want a field flattener or coma corrector. Unfortunately, from messages on this board, nobody was able to figure out how to attach one because the focuser attaches directly to the camera's T ring not the T adapter. That scope is a great way to get started while saving money for something better but your 6SE with focal reducer may be a better starting point. Great picture by the way!
    Thanks! So what exactly does a field flattener/coma corrector do? From what I can tell based on searching, it gives you better detail along the edges?

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    6SE (f/10 1500mm), Celestron C6-N (f/5 750mm)
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    Default Re: Questions about focal reducer and filters/t-adapter...

    Yes. Newts typically show elongated stars near the edges as a result of coma. A field flattener or coma corrector will make them round.
    ... Henk. Telescopes: 6" Mak-Newt (Comet Hunter), ES ED127CF, ES ED80, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: Losmandy G11S, AVX, LXD55, Tiltall, Cameras: Fuji X-a1, Canon SX40, Xt, XSi, T6, ELPH 100HS, DIY: Dob and camera barndoor trackers, afocal adapter, Dob with foldable base and Az/Alt setting circles, Accessories: SSAG, Plossls, Barlows, Telrad, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK

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  4. #24
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    Default Re: Questions about focal reducer and filters/t-adapter...

    Interesting, had no idea... that's good to know tho.

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    Default Re: Questions about focal reducer and filters/t-adapter...

    I have been following this and your other threads. Your choice of the AVX mount is a good choice for AP but unfortunately the newt that comes with it is not so good. In order to use a coma corrector with it you would have to do some serious modification to the scope. These would include but are not limited to replacing the focuser entirely and re-positioning both mirrors. Even if you were to do this, you would not be guaranteed that it would work. You will still be able to use it as is but keep your SC with the FR. If you stick with AP and I am sure you will, you will eventually pick up a nice 80mm Apo for wide field to complement your SC. You are making excellent progress, keep at it and welcome to the rabbit hole.
    This used to be a great place to hang out but now it is not safe here anymore.

 

 
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