Light falloff is mostly due to the lens (not the SB), and maybe a little due to the lighting.

Below are some test shots using the SB with a Nikon 50mm f/1.2 AIS lens on an Olympus OMD. The first three are at f/1.2, giving a 35mm f/0.90, and the second three are at f/2.8, giving a 35mm f/2.0.

Nikon DX has a 28.4 mm image circle diameter. 28.4 mm x 0.71 = 20.2 mm.

• GH2 16:9 non-ETC: 21.4 mm diagonal

• GH3 16:9 non-ETC: 19.8 mm diagonal

• BMCC: 18.1 mm diagonal

• BMPCC: 14.3 mm diagonal

So on the GH2, it's close. It will depend on the particular lens, like mcbob's tests showed. The other cameras are fully covered.

"Working" and "covering" are two diffrent things; DX lenses designed for a 1.5x crop sensor may or may not cover the lesser 1.3-1.4 crops of MFT+SB cameras.

I had a quick chance to fondle a bunch of DX lenses at a local camera store to check their coverage on the GH2 + SB (effective video crop ~1.32?). Here's a quick list of coverages:

Sigma 10-20 (full coverage) Nikon 10-24 (very slight corner darkening) Nikon 16-35 (corner vignetting throughout range) Nikon 18-200 (slight corner vignetting throughout) Nikon 17-55/2.8 (full coverage)

Also tested the Rokinon 8, 35, and 85 primes which worked spendidly; the 8 did have plenty of fishy wierdness at the edges, but that's expected.

The 18-200 and 16-85 were the only two of the lot that had what I'd consider unacceptable vignetting. The 10-24 was very useable, and the Sigma 10-20 and Nikon 17-55 delightful.

Their answer says it all, you just need to use the aperture ring on the adapter. It will work.

The MetaBones adaptor (as with my other two MFT adaptors) each have a mechanism for manually controlling aperture. You can use the Sigma with Nikon interface just fine, but expect to change exposure by hand, and not through any electronic interface.

For those who are expecting a more extensive test, I will be shooting some BMCC with MB-SB tomorrow, and am in pre-production for a TV pilot to shoot later this month, so there's plenty of footage coming soon. I've also pre-ordered the new Sigma 18-35, and will shoot a test with it as soon as it arrives, which is likely to be by the middle of August.

I went back and read a bunch.. but not every single page... im just extremely confuse about it because after sending a mail to Metabones they answer to me saying that the adapter wont work with the sigma lens..

"Sorry! Our nikon g adapter have not electronic control……only support manual focus and manual aperture control. You can use your sigma Lens on it, but need use adapter ring for aperture control"

so i wanted to check here with some of you, that's all, sorry if I bother anybody.

thanks!

@vicharris not quite on topic but yes, there seems to be a lot of new posters who have not read anything from before. Maybe some old ones who are lazy, too.

All Nikon Mount lenses except for the one mentioned by MB will work..........period. Seriously, I really am starting to think nobody reads any past posts in threads anymore. This is happening all the time now, I really don't understand it. For people who have been here for years, is this normal or has it ramped up the past couple months?

@CHARPU I'm using Sigma lenses with Nikon mounts, and they work perfectly on the Metabones Speed Booster. I'm betting the 18-35 will be usable just fine, since my other Sigmas also work.

Here's a test I did:

Shouldnt we expect the Speedboosted Tokina 11-16 to look the same as if mounted on a APS-C sensor? On my old Nikon D80 it's no way as blurred in the corners. Let's see if someone dials in the back focus correctly before we give up all hope for a fast and wide m43 lens.

@Brian202020 +1 & +1 I had the privilege of ordering 2 LCs! They were both identically baaaaad!