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I've got an Olympus E-300 camera I've started playing around with. Its got a four thirds (not micro) mount. On ebay I found a cheap c mount lens with adapter. I didn't read closely enough to realize it was c mount to micro four thirds adapter.

Is there an adapter that will let me use this lens? Quick search turned up nothing (though it's hard to separate out the four thirds from micro four thirds stuff, micro seeming to be more popular now).

I'm guessing no. This adapter makes the lens sit what I assume would be pretty darn close to the sensor, which would be impossible with the mirror on my Olympus DSLR. I'd like to be certain though.

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up vote 2 down vote accepted

It appears that the C mount had a flange focal distance of a little over 17mm, while the 4/3s system is a little over 38mm (this is due to the mirror).

It's not actually possible without changing the lens or body construction and can't be done with a simple adapter.

However, m4/3 is a little over 19mm. You may get a black border (due the the circle coverage of the lens) but here are some samples.

Looks like it does a better job than on APS mirrorless body.

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Ah, flange focal distance, that's the key thing I was missing. Actually, the table from the wikipedia page is handy, because (at least in theory) any lens with the same, or larger, focal distance can be mounted on the camera (of course ignoring a bunch of other stuff that might make it impossible). –  nynexman4464 Nov 7 '12 at 18:58

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