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Thread: How to know which reflectors will reach focus for AP

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    Default Re: How to know which reflectors will reach focus for AP



    Quote Originally Posted by Wire View Post
    I personally wouldn't consider a reflector for AP. A nice refractor would be ideal for AP. Even the reflectors that are astro graphs aren't gonna give you the same shots as a refractor. I just use a reflector for visual, but that's me.
    It's just I want a scope that I can use with both I can only afford one at the moment and AP isnt going to be my primary use of it

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    Default Re: How to know which reflectors will reach focus for AP

    Quote Originally Posted by kingclinton View Post
    First light optics sell the P-DS tange of scopes.
    The 130/150 and 200PDS.

    All very affordable and they focus a DSLR, visually they work well and I have no complaints with my 130PDS, it comes with all the bits and pieces that make it a simple case of attaching the camera without having to purchase additional adapters.


    First light optics-reflectors.

    In the link look for the 130/150/200 P-DS!
    I think I may go with a 130p to keep weight down on my EQ5. Best of both worlds exactly what I'm looking for and affordable I can't afford some of the other suggestions.

    Do other people think for an affordable scope that the above scopes are what I should be looking at?
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  3. #13
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    Default Re: How to know which reflectors will reach focus for AP

    Quote Originally Posted by astrowolf67 View Post
    Are you needing a mount to go with it? If all you need is the OTA, take a look at the offerings from GSO in their F/5 line. They look to get good solid reviews, with optics set for astrophotography, and, include an extension tube for visual. They also come with mounting rings, finder, and dovetail bars, all at a VERY reasonable price. I've been eyeballing the 6" f/5 myself.

    https://agenaastro.com/telescopes/te...hopby/gso.html
    I have the TS Optics version of the f/6, 150mm Newtonian.



    It's a great scope for the money but it isn't really an astrograph. Also, I was a bit disappointed to discover that my TeleVue Barlows won't attain focus. Short Barlows are fine though.

    https://www.teleskop-express.de/shop...EQ3-mount.html

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    Default Re: How to know which reflectors will reach focus for AP

    I did a small review of the scope on my blig(link in my signature).
    As mentioned above some eyepieces, mostly 2", cannot cone to focus, the 130 comes with a extension piece so you can get focus.

    https://kingclintons.blogspot.com/2018/05/ngc-6025.html
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    Default Re: How to know which reflectors will reach focus for AP

    When I bought my main scope, an 8" f/4 Newtonian astrograph, my objectives were like the OP's: to buy a single scope that was good for visual and AP. I soon added a coma corrector, because at f/4, you need one!

    What I didn't realize, but soon discovered, is that the coma corrector moves the focal point out far enough to focus with a DSLR. My coma corrector actually sits where an eyepiece would normally go (i.e. extension tube in place), not at the normal camera location (extension tube removed), yet my cameras focus just fine. In other words, this coma corrector would make (just about) any Newtonian with a 2" focuser into a coma-free astrograph. My coma corrector is a Televue Paracorr 2, but I suspect the Baader MPCC and perhaps others are similar.

    This scope remains my main imaging scope. It worked really well for visual too, in my first few years, though now I typically use a C-11 for visual and planetary.

    Quote Originally Posted by jimminCT View Post
    Ones that are labeled as astrographs will achieve focus...
    or use a barlow to bring the focus point inwards.
    The barlow actually moves the focal point outwards to focus in the camera. On an un-barlowed Newt, the focal point is too far in to focus a DSLR.

    Quote Originally Posted by Sean90 View Post
    So in that case does that mean that every reflector can reach prime focus then with a Barlow or are there still odd ones that don't?
    I doubt if anyone can answer that, since no one has tried every Newtonian. You will only know when you try. A barlow is not a good solution anyway, since it doubles the focal length, thereby removing the Newt's advantage of fast optics.

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    Default Re: How to know which reflectors will reach focus for AP

    Quote Originally Posted by KathyNS View Post
    When I bought my main scope, an 8" f/4 Newtonian astrograph, my objectives were like the OP's: to buy a single scope that was good for visual and AP. I soon added a coma corrector, because at f/4, you need one!

    What I didn't realize, but soon discovered, is that the coma corrector moves the focal point out far enough to focus with a DSLR. My coma corrector actually sits where an eyepiece would normally go (i.e. extension tube in place), not at the normal camera location (extension tube removed), yet my cameras focus just fine. In other words, this coma corrector would make (just about) any Newtonian with a 2" focuser into a coma-free astrograph. My coma corrector is a Televue Paracorr 2, but I suspect the Baader MPCC and perhaps others are similar.

    This scope remains my main imaging scope. It worked really well for visual too, in my first few years, though now I typically use a C-11 for visual and planetary.


    The barlow actually moves the focal point outwards to focus in the camera. On an un-barlowed Newt, the focal point is too far in to focus a DSLR.


    I doubt if anyone can answer that, since no one has tried every Newtonian. You will only know when you try. A barlow is not a good solution anyway, since it doubles the focal length, thereby removing the Newt's advantage of fast optics.
    Yeah, I realized that afterwards, Kathy... But it was too late to edit... Thanks

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    Default Re: How to know which reflectors will reach focus for AP

    Quote Originally Posted by jimminCT View Post
    (just about) You should think about a career in politics...
    Eeeewwwww! No thanks!

    I realized that if I was making a point about no one knowing whether every Newt could reach focus with a barlow, the same logic should apply to a coma corrector, for the same reason. Hence the weasel words.

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    Default Re: How to know which reflectors will reach focus for AP

    This issue is a good example of why a dedicated astronomy shop is better than an indiscriminate merchandiser. If you already have a camera, you can approach the vendor with questions about back focus requirements and adapter hardware. Reputable astronomy shops will be happy to help you design your system. As long as you are willing to specify the camera first, you should be in good shape.
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    Default Re: How to know which reflectors will reach focus for AP

    I too noticed that a CC pulls the focal plane out further. Mine is the Baader. If you use a mirrorless DSLR that helps too, especially if you can find a minus adapter. Otherwise make your own adapter to get the full benefit.

    Since you're in England, pay attention to KCs links. FLO has several Newts that work for AP and visual.
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    Default Re: How to know which reflectors will reach focus for AP

    The eyepiece holder on my Orion Astroview 6 reflector stock focuser can screw off exposing threads. I can now attach my DSLR to the threads and achieve prime focus. Perhaps your scope can do this or consider buying this scope from Orion, the Astroview 6 EQ.
    Scopes: Orion Astroview 6 EQ 6 inch (150mm) f/5 reflector w/Orion EQ-3M Single-Axis Drive and Orion SkyQuest XT12g GoTo f/4.9
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