The Flange Depth Controller "FDC multi" lets you measure how much your Flange Focal Distance is off. Shimming the flange is now straight forward, since the number and thickness of shims can be determined in advance.
PL54 Mounts can be measured directly and Canon EF(S) with the help of an adapter tailored exclusively for the "FDC multi".
More adapters are likely to come.

track "abcd" by martin peter

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