Micro Four Thirds Focal Reducer Shootout

Started Feb 20, 2014 | Discussions thread
MOD Tom Caldwell Forum Pro • Posts: 36,480
Re: Micro Four Thirds Focal Reducer Shootout

TheSquid wrote:

For those of you wondering why there is no OM adapter.... you all are forgetting that the OM lenses are fully manual. Making an adapter would be a nice thing to do but it's not as necessarily needed since the lenses are easily used.

However, making one with electronics would be nice. The electronics would have to control aperture and close the lens down for the exposure via the original olympus manual stop down mechanism. This may be too daunting a task to do. The reasons are that it may not trigger fast enough to actually stop down and secondly, it may not be able to transfer the f-stop information to the camera making it still fully manual exposure instead of aperture priority compatible.

An OM lens could only feasibly be made as a dumb focal reducer. The advantages of a focal reducer on the M4/3 mount are one full stop increase in light gathering capacity plus a 1.4x net multiplier instead of 2.0x

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Tom Caldwell

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