Has anyone tried this with a GH2 + speed booster? Most tests seem to be on the blackmagic. I really want to know if there's vignetting at 18mm or through the entire 18-35mm range or not at all.

On another thread McBob posted that some Nikon and Sigma lenses have mixed coverage: "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)."

Does anyone have a link to a GH2 test? Many thanks.

Amazon UK just informed me my Nikon-mount f1.8 Sigma has shipped, so finally I guess stock has arrived in Europe. I will be shooting test charts before the weekend, both with and without the Speedbooster.

@dtr That will be me, as soon as mine arrives this week. Incidentally, Amazon dropped the price too...

Sigma 18-35mm F1.8 DC HSM Lens for Nikon

                      Price on order date: £799.99

                Price charged at dispatch: £649.00

Lowest price up to and including release date: £649.00

                               Quantity: 1

                          Total Savings: £150.99

thougts2uk , no.

Mine just arrived from Amazon UK. Testing it soon with Speedbooster on my BMPCC, BMCC and GH2.

Here's something I shot yesterday using the Nikon version of the Sigma f1.8 on a Speedbooster with the BMCC. I used REC703 (video mode), with no grading.

Frankly, it's not much better than GH2 footage I've shot before. I hope to do a side-by-side comparison soon.

@SeekingHeartwood, is it possible to post anything with your combination of gh3 sigma and speedbooster. If I had BMPCC with almost 3x crop I wouldn't worry, but I have gh3, I'd like to see the vignette in anything, video or still.

@starios yes, i finally got a chance to shoot a short film with it over the past 2 days here in long beach, i should be able to post some samples very soon

ok, some samples, i shot a white sheet against a wall that was evenly lighted. i used both the GH2 and GH3, each one with the speed booster and sigma 18-25. first i shot video and extracted a still, and then i just took a picture with each. they are labeled accordingly. i hope this sufficiently demonstrates the minor vignette that occurs, draw your own conclusions.

lastly i included 2 stills from the halloween short i shot this past weekend. i used the gh3 with sigma and SB and both stills are uncorrected. the combo performed beautifully during the shoot with regards to both performance and handling. the focal lengths were perfect, the lens combo never left my camera.

yes i was much closer to the clown and the depth of field really gets shallow at close distances, even at a wide focal length. another thing i noticed that i don't see a lot of people mentioning, is that the speed booster changes the focus depth of the sigma. the min focus distance of the sigma is normally about 12 inches but with the speed booster the minimum focus depth is 4 inches, really useful for close up detail shots

@SeekingHeartwood thanks too. Could you tell me when or if the vignetting disappears on the GH2? I've heard from 21mm. Much appreciated.

@SeekingHeartwood thanks, your posts are more than useful, this is my lense :)

First quick test with Speed Booster Nikon mount and Sigma 18-35 on a GH3. All wide open aperture