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  Reasons... I dunno... Why don't you try saving my limited time by reading the article to find out!? APS-C mode on the A7S reduces rolling shutter from some of the most severe on any camera, to around the level of a dedicated cinema camera like the FS100. So if you have a shot that benefits from the full frame look but also requires less skew from the rolling shutter, switch to APS-C mode and attach the Speed Booster.

The Speed Booster ULTRA has new optics and is available for E-Mount and Fuji X-mount (APS-C or Super 35mm sensors). The adapter has the latest evolution of optics from Caldwell Photographic in the US. The new optics bring an increase in performance, with sharper corners and better contrast. The new design is an extremely advanced 5-element / 4 group tantalum based optical formula. The old version of Speed Booster will be phased out. Read the full article here

Which one is it? A7s? GH4? Nikon? Canon? Canikon? What? Oh, you mean it's not the gear that makes compelling motion pictures, it's artistic skill...? Oh well, I guess I'll just go look at some DxO sensor charts then instead of looking at this: So, yeah, I'm being snarky, but the point is this: just about everyone has access to viable imaging capabilities now. The 13 year old girl with a new smartphone has more impressive technology in her hand than most pros did 10 years ago. The more we worry about specs, the less relevant we become as actual filmmakers. I mean, I kind of wish my profession was a bit more insulated from everyone as a competitor, but the other hand, dang, affordable technology sure is fun! Anyway, my rant stems from standing behind a so-called-pro at the airport yesterday. He was claiming to a colleague that anything done on a camera lesser than a RED Epic was "amateur hour." Seems like a ridiculous philosophy to me, but what do I know? I'm not doing high-end stuff, just making a living on the fringes. Maybe he's right?

The fundamental problem is that the Speed Booster shrinks the vertex length of the lens (the distance from the front glass surface to the image plane). So even if you could mount the SB optics inside the C300 EF mount you wouldn't be able to focus to infinity because the EF mount protrudes too far. Even if you could design a focal reducer that maintained the vertex distance you would then have the problem of mounting the optics since an adapter approach wouldn't work (zero flange-to-flange distance).

Spamming unrelated threads is really frustrating for other users. Please stop. You were heard the first time.

I'm going to say Canon Electronic. Say what you will about Canon's cameras, but their lenses are very good, and widely available. If you do paid gigs it's certainly the Canon, their lenses are widely available to rent all over the place, not to mention CP and ZE Zeiss lenses. IF you end up in a pickle, you can call rental houses and find an EF mount lens last minute, no problem.

Is there any word whether this new glass is inside the new EF to MFT SpeedBooster as well? It wouldn't make sense to release a new product with old glass, but I'm kinda suspicious that that's the case here.

Hi Sir Danish, Thanks for the reply. Yes, I think I have exactly the same problem, but worse. Most of the time the blurriness appears on the left side, but sometime it's on the right side as well. I also replaced the product (SB for BMPCC) as soon as I found this problem, but the second one has the same problem as well. I have BMPCC, SB for BMPCC and several Nikon mount lenses but no MFT lens, so I borrowed SLR magic F0.95 lens (MFT mount) from a friend then I had the similar problem with no Speedbooster. Then I thought the problem is BMPCC itself and sent it to Blackmagic Japan for check the product. Blackmagic Japan checked my BMPCC with Cosina Voigtlander 17.5mm F0.95 and could not find any blurriness in any cases, and they said this is the problem of compatibility between Speedbooster + BMPCC or the SLRmagic lens + BMPCC. The followings are the data which I found this problem at the very first time. I shot this footage with my BMPCC, SB for BMPCC + Nikon AF50mm F1.4D at a Japanese shrine. Those two images are 28th DNG and 555th DNG from the same sequence (with fixed focus). 28th DNG https://drive.google.com/file/d/0B9fhU4X7bCLkNEFyMFNLWjVWRU0/edit?usp=sharing 555th DNG https://drive.google.com/file/d/0B9fhU4X7bCLkc3h0LW1rbm1TUzg/edit?usp=sharing I created those image for Blackmagic Japan, so the yellow charactor is Japanese and meaning 2x magnification. I shot this sequesce panning stairs form the bottom to the top, so the 28th image is about 5m (15ft) away and the 555th image is about 8m (25ft) away from me. As you can notice, the 28th image is soft on the right side, and the 555th image is soft on the left side. From this result, I suspect the SB or BMPCC mount tilting, but the problem is not happening always. If I set the focus infinity, the blurriness always appears on the left side as you mentioned. At first, I thought this problem happens only extreme situation such as shooting at very fast aperture like F0.8 (SB+NikonF1.4), but recently I realized this problem happens not only at very fast F value, but also at the usual F value. The following image is from a footage shot by setting F3 at Speedbooster with Nikon 50mm F1.4D. https://drive.google.com/file/d/0B9fhU4X7bCLkaFcyaEp1RGdYZVE/edit?usp=sharing Also please watch the following movie shot by setting F4 at Speedbooster with Nikon 50mm F1.4D. Sorry for the shaky movie because it was very windy. For the comparison, the following link is the movie I shot at the same day with the exactly the same setting. I changed the angle a little bit and re-set the focus. I shot about 6 movies on that day and only 1 movie above had the problem. For now, I asked the Metabone's product distributer in Japan to borrow me the new Speedbooster EOS mount for checking if it has the same problem. I'll make a report of the test result here when I got the new SB EOS mount test result.

I don't think its unethical. Just look at Software. Companies will make LITE versions, or PRO versions. Obviously there are features disabled in LITE for a lower price. You could say the same about Cameras, and hardware.