Testseek.co.uk have collected 1 expert reviews of the Sigma MC-21 Mount Converter and the average rating is 80%. Scroll down and see all reviews for Sigma MC-21 Mount Converter.
(80%)
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Allows any EF-mount lens to be used with L-mount cameras
Electronic aperture operation and image stabilisation work consistently
AF generally works OK with ultrasonic motor lenses
Allows any EF-mount lens to be used with L-mount cameras, Electronic aperture operation and image stabilisation work consistently, AF generally works OK with ultrasonic motor lenses
Doesn't support continuous autofocus, AF works poorly with micromotor-equipped lenses
I tested the MC-21 on the Panasonic Lumix S1, using a range of lenses of various vintages right back to 1986. With the MC-21 adapter, the camera clearly only uses contrast detection for autofocus, so its noticeably slower compared to using a native lens...
