Using 4/3-mount lenses on MFT cameras

SteveNunez

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Thank you for the reply- so does the typical 2X crop apply to adapted 4/3 lenses? I just bought a 50-500 Sigma and am thinking there's a 2X multiplier- is this correct? (100mm-1000mm)
 

PakkyT

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Compared to a 135mm film camera or "full frame" digital, that is correct, the "Bigma" is equivalent to a 100-1000mm field of view on those larger sensor cameras.
 
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… does the typical 2X crop apply to adapted 4/3 lenses? I just bought a 50-500 Sigma and am thinking there's a 2X multiplier- is this correct? (100mm-1000mm)
Sort of.

The perspective, or relationship between near and far things, won't be 2x, but the angle of view will be exactly the same as if you cropped the middle 50% out of the original 24mm x 36mm frame.

Bottom line: focal length is still focal length. The lens does not get "longer" when you put it on a smaller sensor. It is best to try to re-calibrate your head for the actual millimetres, rather than to always multiply things by two. For example, a 25mm lens has a "normal" angle-of-view on either 4/3rds or µ4/3rds, like a 50mm lens has on 24x36.
 

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