Testing the Canon EF 85mm f/1.8 USM, as well as the Canon EF 50mm f/1.8 STM, using the Sigma MC-11 adapter on my Sony a7 II.
The 85mm is sharp. It looks like it’s the sharpest lens I own. It’s also the heaviest prime lens I own. The only downside I can find is lots of green and purple colour fringing on contrasting edges and bright areas of the image. It’s a bit of a beast of a lens. Not the lens itself, per se, but the focal length and the optics the lens houses. I was struggling like mad; I’m not used to an 85mm focal length, as I’m a 50mm kind of guy. It’s so new and so challenging to use the lens, I might have to seriously consider on returning it, since I have no idea if I’m ever gonna get used to it.
The Sigma MC-11 was worth spending $150. Before that, I was using this $100 Fotodiox adapter that (granted) had the electronic pins so that it allowed the EXIF data from the lens to the camera. I’ve been using that adapter for nearly 4 years, and for nearly 4 years, I was manually focusing the Canon 50mm, since the autofocus performance wasn’t reliable. Not an easy thing to do with a fly-by-wire lens, but I managed. When I mounted the 85mm to that adapter, it wouldn’t lock on focus at all; it just kept hunting back and forth. Seeing that the price dropped for the MC-11 during Black Friday, I bit the bullet and ordered it. I’m glad I did. I can use autofocus on all the Canon lenses I own. Performance differs from lens to lens, but it works, and it locks on focus accurately, even in low light conditions. That’s all I need.
Being able to use autofocus with the 50mm was an absolute joy. I don’t have to be so tense whenever I hold the camera up to my eye, constantly magnifying the viewfinder, second guessing whether or not I was in focus, even when I stopped it down. Now, the autofocus performance isn’t as fast as my Sony native lenses, but it’s fast enough to take a photo of something; you’re not gonna miss a shot because you were taking your sweet ass time, fiddling with the manual focus ring, wondering if the subject’s in focus. It’s fast enough, it’s good enough. I’m really happy with the setup that I have now.