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Duncan,
I checked my C11 and the ID of the baffle tube is 2.140" or 54.5mm aprx. I am building an adapter for a pentax 6x7 to a GEG on the C11 out of an outer bayonet extension tube. I expect vignitting but 54.5mm image circle is better than 24x35mm. The 6x7 is 55x70mm.
What is the reason for your question?
Ric Thiem
Alb. NM
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