Just ordered an adapter from Ciecio7. Communication over ebay messages as been good. The product looks great from the ebay pictures and description/specifications. Though it was not overly expensive (definitely not cheap) it was priced as a professional product. From that standpoint I am expecting a lifetime of quality use.

As far as c-mount to micro 4/3's adapters go, the Metabones looks to be top of the line based on the materials used, not sure about the ramifications of the design. I might try one in the future when the Aluminum ones I have wear in threads. Right now I have been using the one from the Hawk's Factory which allows as much depth as possible to seat the c-mount lens, though it is not a flat/slim adapter. On that note sometimes you have to grind the lens to get it to seat far enough towards the sensor to get focus to infinity, so if you are grinding the lens anyway the Metabones adapter will "most likely" not be a problem, but one will need to test for one's self.

These little primes from Canon in the TV-16 line are really special, even the 13mm 1:1.5 covers.

I tested the Canon against the Cosmicar 12.5 and the Lumix 12-35mm @12mm now, and it is definitely softer. It has funky distortion, even more than the uncorrected Lumix and the light-weigt and cheap Cosmicar has less distortion than both. The Cosmicar is sharper from the start than the Canon and has less CA (but still some).

At 2.8 the Cosmicar is at least as sharp in the center as the Lumix! It's always a bit more greenish than the others. it has about the same viewing angle as the Lumix set to 12mm, so either the Cosmicar is wider than 12.5 or the Lumix isn't as wide as it claims.

The Canon never get's too sharp in the corners, but it has "character". It's warmer, has some soft haloes WO and very nice bokeh with it's 10 blades. Very good build quality too, the Cosmicar with it's thin aluminum tube can't stand a bump, the Canon sure does.

These are nice lenses, but they are pretty large and don't come in very wide versions.

Rather go for the Tevidon series from Zeiss Jena, they were made for one inch sensors (or tubes) and start at 10mm. Excellent for the small camera.

For both series keep in mind that production from the communist era has massive sample variation. They were capable of making very good glass, but end control was sloppy (even if Lenin said something like "trust is good, control is better").

Anybody around who has successfully adopted the Cosmicar 12.5 to 75 zoom to a MFT adapter going to infinity and can confirm that it covers the BMPCC completely, even around 18mm?

There is too much contradictory information floating around. I have one sitting here, but before taking it apart for machining down the rear, I'd like to know if it's worth the effort.

TIA

@AlbertZ I have a few Pentax A110 lenses (18mm, 24mm, and 50mm) and a BMPCC. I haven't really tried them in any serious way on my BMPCC yet because I don't have any step-up rings to get filters on them (and I suspect that a ring for the 24mm will look ridiculous with even my smallest filters, that sucker is SMALL). It's a fairly overcast day today, though, and I suspect it will be for the next few days, I can probably get some usable exposures. I could certainly take it out and shoot a little bit of footage for you. Would some boring landscapes and leaves be good enough?

I had the pentax 110's on aps-c (nex) and that only showed minor vignetting (but full coverage, just a tad darkened vignetting), i can imagine it will be more good coverage wise on the bmpc's small sensor.

@eatstoomuchjam cool, good to know! Thanks!

anyone put the tamron 17-50 2.8 on the bmpc yet with or without speedbooster?

I was wondering if this setup would be a problem. Since I own Canon FD lenses, I was going to get the Speedboost FD >m43. I also want to purchase the Sigma 18-35 f1.8. I was thinking of getting it as a Nikon mount then putting a Nikon>FD adapter. Would that work? Or would I run into focusing issues? Would doing it the other way around work better?

@JuMo Thanks for responding... Maybe I should purchase new 50 and 85mm Nikon glass instead.

@JuMo I'm excited for the adapter! I just need to get lenses on the wider side that are fast

Fujinon Tv Zoom 14-84mm f/1.6 and Schneider Cinegon RX 10mm F/1.8 (wide shots of the fall)