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Camera to flattener distance


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I have a Williams optics flattener I & Flattener III and both quote 56mm spacing, does this mean from the thread or actual lens?

I will be using them with my ATIK16hr with 18mm back focus and Canon 550d with 44mm back focus.

I was going to get spacers, 38mm for the ATIK and 12mm for the Canon would that be correct?

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