Thread: Tolerance on Takahashi metal back distance?
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Old 05-07-2009, 10:48 PM
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Phil Hart
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Location: Mount Glasgow (central Vic)
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Tolerance on Takahashi metal back distance?
hi

I'm getting adaptors made up to connect a QHY9 to my Takahashi Epsilon 160 f3.3.

Takahashi recommend a 'metal back' distance from the thread on the end of the correcting lens tube to the focal plane of the CCD of 56mm.

I can't quite get the adaptors and motor housing on the filter wheel to fit within this distance and will be about 2mm out.

Does anyone know if that is enough to degrade image quality?

cheers
Phil
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