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I have plate solved an image with the focal reducer and the measures focal length is 1649, so 4mm longer than spec.
I'll have a go at changing the back focus distance to see if I can get it to look flatter.
BUT, I should not have to do this. It is a VERY expensive reducer and it is advertised has having the same back focus.
Does anyone else need to change their back focus when changing from F10 to F7?
Thanks.
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