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 p.15 #17 · Sigma MC-11: Compatibility, Performance Thread. | |
Great info. Thanks for posting.
I have the A7R and A7S and have been wondering if the Sigma adapter would be a good choice for my last remaining Canon lens, the 70-200 f/4 IS It's a great lens but AF is all but useless on the Fotodiox adapter. Which also has light leaks. I have been wondering if the Sigma might be a better choice, but it sounds like the gen 1 bodies don't work well at all.
Gunzorro wrote:
My initial results are a little disappointing. I haven't been able to match the performance I've seen in videos for focus acquisition and confirmation. Mine is certainly better than the Fotodiox (worst with the most lenses) and Commlite (closer to the Sigma), but nothing like I'd hoped.
I am using the old a7R, and this might be why I'm getting such bum speed and accuracy.
The Fotodiox works well with some lenses, in fact better than the Commlite. But the Commlite is faster, more accurate and crashes less often. Both are terrible in acquiring AF near MFD, often confirming totally OOF images as in-focus. Both hunt, and will sometimes stall, needing to be refreshed several times with the shutter button. The Fotodiox fails most, utterly refusing to focus. Both need the camera shut off once they've been "baffled" by an impossible assignment.
The good news, even if the a7R is the problem, is that the Sigma is more assured in focusing, although still dreadfully slow and needing immobile subjects for use at its fastest pace, which can be focus acquisition in several seconds from initial half shutter press and hold. Sometimes longer. And the other two -- especially the Fotodiox -- can take two or three refresh half-presses, and still not focus. Absolutely no way to use any of these combinations for paid event or faster paced commercial work.
Perhaps I'll learn some new tricks or settings to produce speedy focusing like I've seen in YouTube videos. But not so far.
Regarding the Sigma:
1) It has the best contrast of the three, and short of taking any twilight time exposures with light sources in the frame, it seems well baffled and flocked. The other two are simply baffled, with the Fotodiox having multi-stepped baffle design.
2) Operates the fastest of the three.
3) Works best with the newer lenses such as EF 24 and 35 IS, 40/2.8 STM and 24-105L IS. Works fairly decent with the original 24-70/2.8L and 100/2.8L macro. Works surprisingly well with 16-35/2.8L II -- outstanding sharpness in center when wide open, and decent on edges (not perfect) at f/11. Even the older 17-35/2.8L works pretty good with the Sigma.
4) Almost completely useless with my 50/1.2L. Maybe the lens would perform fine on the a7RII.
5) Absolutely failed on all my earlier EF lenses such as 50/2.5 CM, 15/2.8 FE, 135/2.8 SF, and of course 28-70/3.5-4.5 and 35-105/3.5-4.5.
My next trip to Washington, I'll take the Zony 24-70/4 and the Sony 28/2 along with the Sigma MC-11 and Canon 16-35/2.8L II (and little 40 STM). I think it would be best to have a native mount such as the Zony 16-35/4, so maybe someday. For now, I'll use the Canon for UWA.
Even with the native AF lenses, I find the Sony very toy-like and slow for focusing and shooting. It produces great images, and is extremely versatile with Alt manual focus lenses, so I don't terribly mind putting in the extra effort to make it work for me. But for my preferred types of hand held shooting, it is light-years behind the Canon 5D3 and Nikon D800e....Show more →
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