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  1. #1
    kszakonyi's Avatar
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    Default Canon vignetting do I need 2" adapter?



    I get a lot of vignetting with my Canon camera and T ring combination. I was wondering if I need a solution with maybe a wider ring on it. If my connector had a wider barrel would it cause less vignetting? I use a 6.3 focal reducer but it looks like I just have a round circle in the middle of my photo, and I have to do a lot of work to get the vignetting out. Would something like the adapter in the link below work or do you have other suggestions?

    http://www.telescopeadapters.com/

  2. #2
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    Default Re: Canon vignetting do I need 2" adapter?

    Which Canon are you using? I have a reduced frame Canon (7D) and have not noticed any vignetting with a 2" adapter.
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    Default Re: Canon vignetting do I need 2" adapter?

    I cleaned up most of the vignetting in my images when I upgraded from 1.25" to 2" barrel, usually the first and most drastic way of cleaning up vignetting with a DSLR.
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    Default Re: Canon vignetting do I need 2" adapter?

    Quote Originally Posted by kszakonyi View Post
    I get a lot of vignetting with my Canon camera and T ring combination. I was wondering if I need a solution with maybe a wider ring on it. If my connector had a wider barrel would it cause less vignetting? I use a 6.3 focal reducer but it looks like I just have a round circle in the middle of my photo, and I have to do a lot of work to get the vignetting out. Would something like the adapter in the link below work or do you have other suggestions?

    TELESCOPE CAMERA ADAPTERS |TelescopeAdapters.com
    Please visit 'Settings->Edit Signature' (should be visible in the page header near the top right) and add your basic equipment configuration to the signature section - it will help others to answer these questions without a lot of iterative posts, or 'kreskin'-style assumptions...

    Use of a focal reducer often increases vignetting - the light cone is compressed severely, especially in SCT's under 9.25", and exacerbated with full-frame cameras (i.e. Canon 5D, 1D and similar full-frame).

    In general, if you're using a full-frame DSLR, you need a 2" T-ring/T-adapter combination - if you're using a focal reducer, this may, or may not help. In some cases, using a shorter T-adapter will help when a reducer is in use. These can be purchased (used to be Scope Stuff was a source), or cut-down using a lathe from an existing T-adapter.
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    Default

    It looks like Tapitalk doesn't show my signature and now that I think about it, I never see anyone else's signature when using this application either. I am using a canon 40d, Celestron 8se ota on a cg-5 mount with a 6.3 reducer. I am seeing a ton of vignetting with mt t-adapter and t-ring.

  7. #6
    kszakonyi's Avatar
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    Default

    Quote Originally Posted by MLaferriere View Post
    Which Canon are you using? I have a reduced frame Canon (7D) and have not noticed any vignetting with a 2" adapter.
    What 2 inch adapter do you use?

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    Default Re: Canon vignetting do I need 2" adapter?

    I use the 2 inch Ultrawide that you provided a link for, but I have a full frame sensor and use an f4.7 scope. With my newt I have 2 maybe 3 mm of back focus, but I don't have the vignetting that I had when using the T-ring adapter which came with my scope.
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