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    Mattlitespeed's Avatar
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    Default Nikon v1 back focus issue



    I have a Nikon v1 dslr camera and have the common back focus issue as the only adapter available is too 'deep'. Is a Barlow the only way to go to get in focus as I don't want to buy one and find out that it still does not resolve the issue? I have a basic Celestron 76EQ reflector scope that does give me blurred images of a good size on the camera screen so I guess that I am nearly in focus.

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    jerryTheC's Avatar
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    Default

    The problem with many visual newtonians is that the focal plane is inside the focuser - which makes sense for use with eyepieces - but often means that you can't rack the focuser in far enough to get the camera sensor to the focal plane.

    You could try a Barlow, which may or may not work, or (if the scope design allows) you could move the main mirror cell further up the tube, thus moving the focal plane further out - but that also means that you're likely to lose some light as the light cone may become too wide for the secondary mirror to catch all of it - so may not be worthwhile with a small scope...

 

 

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