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Old 10-07-2018, 07:39 AM
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Atmos (Colin)
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Join Date: Aug 2011
Location: Melbourne
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The back focus of a Canon lens is 44mm and 46.5mm for a Nikon.

The QSI one may be a lot more expensive but it’s got the correct back focus and I imagine, considerably better build quality than the Bintel one.
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