I think *only* the 7.5mm is purpose build for m43.
Then there are purpose build APC lenses, most of the more recent Samyang
lenses, like 10, 12, 16mm. The rest are just FF lenses. Both the APS and FF
lenses are much larger. Except the 12, which is specifically for mirrorless
(there is a S*ny e-mount version too).
So if weight is important, you can only buy the 12. It is not that much
cheaper then the Oly, and lacks AF...
Best, Frank.
2014-05-17 13:58 GMT+02:00 Chuck Norcutt
> Thanks to all who responded on this thread. Sounds like I won't be buying
> any E-system lenses over m.4/3. I'm not inclined to add heavy f/2 optics
> to my lightweight camera and also not likely to spring for an expensive
> adapter to accommodate 1 gotta have lens.
>
> I found the mention of the Bower 7.5 interesting. I've never wanted a
> fisheye lens but there are lots of other MF lenses for micro 4/3 from Bower
> and a few others. You can find them all by searching for "Rokinon micro
> four thirds lenses" on B&H. Some of these lenses appear to be old full
> frame designs adapted to m.4/3 but some must be purpose built.
>
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