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  1. #1
    epeddy1's Avatar
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    Default A few questions about NexImage and Afocal AP



    I've got a couple of questions, 2 about the NexImage and 1 about afocal. Debated about making seperate threads, but whatever, here they are.

    Question 1: Is there any way to get a wider field of view with my NexImage? I already have a f/6.3 reducer and the .5 NexImage reducer. But look at this Sun pic, it's way too big.

    I did the best I could to sharpen in post processing, but it still looks fuzzy because there's so much magnification. Which leads to my second question...

    Question 2: Any tips on focusing with the NexImage? Seems like I'm losing on potential quality because I have a hard time focusing. I have a parfocal ring, but don't really know how to use it to it's full potential, and there's not much room for me to slide the NexImage in/out of the diagonal I have. Here's a moon pic for example.


    Question 3: I was trying to take afocal pics of the Sun, but this weird ring kept appearing. You can see it in the below pic. Is that something that can be avoided? I'm using a regular Canon Powershoot (point-n-shoot) camera and holding it up to the EP (Celestron 8-24mm zoom). Is it the camera? EP? Both?

    Notice there's nothing wrong with my moon pic using the same method.


    Thanks so much!
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
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  2. #2
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    Default

    No Help???
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
    Celestron 15x70 Binos w/ tripod, Celestron 6SE + 9x50 finder, EP/Filter Kit, Solar filter, f/6.3 reducer, OIII, LP, and UHC filters, NexImage, 8-24mm Zoom EP, Canon T3i
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  3. #3
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    Default

    A focal reducer would decrease the mag and increase the FOV for for Nextimage.

    I didn't see the ring in your pic but it could be just the tube if the mag wasn't high enough or the camera position correct for the EP. That's what happens when don't set my camera up correctly for Afocal pics.
    Clear Skies

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    Default

    As for focusing your NexImage, the best bet is to start with a rather bright star (not Moon, not Planet, and maybe not Sirius). Once you have the best pinpoint image possible, slew over to your target Moon or Planet.
    If you want to take that further, get an inexpensive Bahtinov Focusing Mask for your scope. Then focus on that bright star, using the Baht Mask's spike pattern to confirm you are indeed as well focused as possible.
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    Default

    Quote Originally Posted by seigell View Post
    As for focusing your NexImage, the best bet is to start with a rather bright star (not Moon, not Planet, and maybe not Sirius). Once you have the best pinpoint image possible, slew over to your target Moon or Planet.
    If you want to take that further, get an inexpensive Bahtinov Focusing Mask for your scope. Then focus on that bright star, using the Baht Mask's spike pattern to confirm you are indeed as well focused as possible.
    Wanted to come back and say thanks for this suggestion. I used Regulus to focus for my Saturn image, and was thrilled with how crisp it turned out. Check it out in my album if you'd like. Thanks again!
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
    Celestron 15x70 Binos w/ tripod, Celestron 6SE + 9x50 finder, EP/Filter Kit, Solar filter, f/6.3 reducer, OIII, LP, and UHC filters, NexImage, 8-24mm Zoom EP, Canon T3i
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    Default

    I use registax and if I remember rightly it has the ability to dering if it is a problem on images. It may be worth looking into.

    I also saw ringing in images when using a coma corrector on the full moon due to imprecise focus, this came inline the closer to perfect focus I achieved.

    Rather weakly informed advice I'm afraid but may give some insight.

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