Quote:
Originally Posted by OsmosisStudios
... As long as you can find a good 50mm or 85mm lens with a f/1.8 or f1.4 aperture, you should be in business, at least equipment wise.
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Um, with four-thirds's 2x crop factor, I'd amend that to a 25mm, 35mm, or 50mm.

But to get these kinds of lenses relatively inexpensively and great quality, you'll want to know about adapting and using manual focus and stop-down metering. Because
natively ((i.e., not going to Sigma lenses designed for APS-C/full frame), you've only got one wider-than-f/2.8 prime lens: the Panasonic/Leica 25mm f/1.4. Which goes for $900. The Oly 14-35 f/2 might work; it's only $1850.
If you'll go with manual focus lenses, then Oly's OM-mount lenses might work, but the wider you go, the more expensive the lenses get the faster you want to go, and f/2 is probably the fastest you're going to find, if you can find them used.
You may want to rethink your mount decision, if you want to use fast primes for portrait shooting. Admittedly, you may not need to. Or maybe the Sigmas will be good enough for what you want. But I can't help thinking a used consumer-level Nikon or Canon body might be better.