Looks like AF-C will not work: https://www.sigma-global.com/en/lenses/cas/product/accessories/mount-converter/
Yeah. It has been known from the very beginning that AFC does not work. I am going to use MC11, which I have had one for MF lenses, and intend to use it in studio setting in which AFC is not used nor critical. Instead, AF speed and accuracy are of paramount important. If MC11 works well with Canon EF or compatible lenses, I plan to invest one or two cheap to not-so-expensive Canon EF compatible lenses.
CK I don’t have the MC11 adapter but the 20-100/1.8 works with the Metabones Speed Booster EF-M4/3. I also have the Viltrox M1 and M2 adapters - I will try it out later today to be sure - and confirm. I have found that in general Sigma EF lenses seem sweet enough on Metabones.
AF-C rarely works on any EF adapters to M4/3 - there have been some reports of successes on the E-MIii body. AF-S is usually pretty good.
CK note that all Sigma DC lenses are made for the aps-c image circle only - including the Sigma DC 50-100mm f1.8. Which makes it an unique high specifcation lens on a M4/3 body focal reduced - or even not focal reduced - but it is only going to play in crop mode on your A7II - maybe on a NEX? It is a large lens and is heavy.
Yeah... I'm not sure why they say that. Maybe they really mean that AF in video doesn't work? AF-C works fine with my Tamron 24-70/2.8 on an MC-11 (A7II and A7R2). Seems odd that it would work for a competitor's lens and not one of their own.
Tom, I know it and will treat this lens as an initial step to get some reasonable Canon EF compatible lenses for NEX and A7II. I have bought that 50-100 and a cheap Tamron 60mm f/2 Macro for Minolta and Sony A mount (because I have the Sony adapter).
Forgot my promise for a while and then remembered it - I can only test properly on compatibility to M4/3 and as both adpaters seem to use the same firmware for their non focal reduced lenses then one test serves both purposes.
Will receive a Canon EF compatible Sigma 50-100mm f/1.8 the coming Tuesday and test it with my MC11 usingt a NEX6 - the studio cam for shooting my blog equipment images. A Tamron 60mm f/2 Macro will come some time next week. Both are APS-C sensor lenses, which is fine with me because I don't need extremely high resolution and I only need convenience.
I have never played a Mamita 645 which is not my cup of tea. I did own a Contax 645 for a long time and sold it. I have some soft focus lenses, mainly because of interested in its optical design. I have two Pentax soft focus lenses: 85mm f/2 and AF 85mm f/2.8 (forgot the max aperture), an Imagon 90mm for Leica, a Fujinon 85mm f/4, a Canon EF 135mm f/2.8, a Sima 100mm f/2 cheap lens, and a Portragon 100mm f/4 (also cheap and lousy). The original Imagon is an achromatic doublet which is specifically designed to produce a soft image by introducing excessive controlled spherical abberation. This Imagon became the base of many later lenses (e.g., Pentax 85mm f/2). However, the Imagon use three discs, each of which has a different number of holes that allow the incoming light to pass through. This modifies the aperture AND the sharpness. This is the longest survived soft focus lens. Maybe someone could have a kickstarter to make this lens again. The Pentax version is different in that Pentax uses aperture ring to cut off peripheral light to improve sharpness. The Fujinon 85mm f/4 shares the same design, but with a fixed disc with holes directly built into the lens tube. Maybe your Mamiya is of this type. The Canon 135mm f/2.8 and the Pentax AF 85mm f/2.8 (?) -- and Minolta alikes -- use internal elements to alter the softness of the final image. The Nikon AFD 105mm f/2 DC and AFD 135mm f/2 DC use the same concept for smoothing forground and background rather than making the image soft. If you have any chance, get a Nikon AFD 105mm f/2 DC and play with it, I am sure your will have a lot of fun. The problem is that this lens does not make good looking bokeh in the foreground; however, this lens is very sharp at the center.
you should be asking that question in the sony milc forum.
that sigma chart claims that no lens will have af-c, lol, every lens has an "x" in the center column.
I have not used my NEX6 with EF lenses adapted my Metabones for quite a while. But it had not trouble with cdaf whn I had a Canon EF 200/2.0 lens on it. In fact the A7R that I also tried the same lens on was appreciablly worse off. Furthermore as Metabones firmware improved it never made using adpated EF lens on the series I A7R much AF fun. The word was that the Sony cdaf was pathetic and as Metabones had to use the cdaf on that prticular model and that was going to be as good as it gets - luckily Sony went pdaf on its sensors for subsequent models even though Panasonic seems to have made cdaf not only very quick but also (cdaf-like) accurate for S-AF on its camera bodies. Unfortunately C-AF still does not work on the same Panasonic bodies and most Olympus bodies - although some success has been anecdotally achieved with the Olympus E-MIii which has pdaf.
I bought my A7R to use with adapted EF lenses only so I never bought any native Sony E/FE lenses or I might have been more pleased with it. I was using a 5D for theatre work and it was getting old and I was impatient even then with Canon’s refusal to go FF ML. Tried in theatre the cdaf was hopeless on EF lenses and later advances in Metabones firmware improved but did not satisfactorly cure my issues with the A7R so it became an orphan camera body in my collection. I pull it out every now and then and have another go at trying to like it
Hasn’t worked so far ...Not sure that the NEX6 was a hybrid but I will bow to a higher authority. I always found that the NEX6 handled EF lenses better when adapted via Metabones. I quite like that camera even though it is very obviously very basic in features. My comment was that it was the only camera I have had where I ran out of “features” to allocate to functions and it only has one function button ... but it is a nice camera to use - especially when you re-allocate the screen magnify to the AEL lock button to save dislocating your thumb.
Not being an expert in the firmware offered in these critturs but having a minor coding background ... from what I have read it seems that the main object of these lens-camera body interfaces is to link up the camera’s internal systems to the lens. Consequently there are no improvements offered by the adapter manufacturer only linking to internal systems offered by the camera - as such the interface lives and dies with whatever native AF system that the camera offers. It is posisble that the adapter manufacturer missed a “focus circuit” but I would have thought that harder to miss than to find.
Tom, never mind. My SIgma 50-100mm f/1.8 Art came Tuesday afternoon. I mounted it to a MC11 and then mounted the combo to a NEX6. It worked nicely; however, focusing speed sometimes was slow. Sometimes the lens can hunt for a while and then stopped focusing. When weather permits I will take it out under the sun and test it again. How good is this lens on a Canon EF body is not clear though.
I still have a Canon 30D and a 5D body. But honestly I could not bother even trying. These camera bodies are now well out of date and the 50-100 is aps-c only anyway.
