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Questions about a specific problem or issue, often dealing with a lens, camera body, image sensor, lighting equipment, or software specific to photography.
6
votes
How can I fix Err 01 with a film-era Sigma lens on a Canon DSLR?
This is old question but problem is still actual on old lenses. What you need is protocol interface which converts aperture change command from camera to lens. Please see my article at this link where …