I've had such good luck with the Panasonic GH3 in the video realm that I am now trying out zany lenses to shoot with and I've come to like shooting with some of the same lenses for my conventional photography. On Monday this week I was making portraits of architects and while I wanted images with defocused backgrounds I just wasn't into carry around the bag of full frame Sonys and all the lenses. We weren't shooting studio style, I was shooting environmental portrait style. That means that I didn't mind supplementing the existing light but I wasn't going to set up backgrounds and soft boxes and flashes either.
I've had good luck using adapters to mine the rich vein of the manual focus Olympus Pen FT lenses such as the 60mm 1.5 and the 40mm 1.4 but I wanted something just a bit short and equally fast. My other option in the Olympus drawer was the Pen 38mm 1.8 but that lens is a bit flat and flare-y and really on gets acceptably sharp from 3.5 on down. Not what I was looking for in this instance.
I looked around the studio and decided to try the behemoth Rokinon 35mm 1.5 Cine lens. I had a Sony Alpha to m4:3 adapter just sitting there looking pretty on my (actual) desktop so I put it all together and attached it to the front of a waiting camera. Do the quick math and what you end up with is a 70mm equivalent that opens up to t-stop 1.5. Nice----if it's sharp enough.
I shot a number of wider, environmental portraits with it and I like what it does to the backgrounds and the tonalities in general. While it's sharp enough wide open it does better at f2 and better still at 2.8 where it is just about perfect. Of course, by then you're starting to give up some of the benefit of the narrow depth of field. But overall, wide open it is sharper than the Pens.
The portraits look pretty darn cool. I also tried the Sigma 50mm 1.4 lens on the adapter and then I was really happy. The center part of the lens (the part I really care about) gets sharp really quickly and the equivalent of 100mm is just exactly in the sweet spot of my portrait lens taste profile.
Long enough to get close but not so long as to exclude all detail. It's a well done lens. Even (or especially) for micro four thirds. I can only imagine that the new version is that much better.
I am interested in hearing from m4:3 shooters about their favorite lenses for doing narrow depth of field. I presume everyone has a "go to" portrait lens but I'm especially interesting in reading about adaptations of older (and newer) lenses that are being re-purposed away from their original format targets. Whaddaya Got?