Manual focusing with Canon 5DS R camera?

I am looking at getting a 135/2 lens for use with the Canon, but it has a finder screen optimized for lenses no faster than 2.8. With the older 5Dmk2, I could get a higher contrast focusing screen for use with fast lenses. 5Dmk3 omitted that option, and 5DS R seems to lack it as well.

My options seem to be live view with a magnifier (clumsy) or just using the Sony A7R. I am not at all sure that Canon AF (or electronic focus confirmation with manual focus) is accurate enough for focusing a 135/2 lens wide open consistently. Does anyone have experience either way?

Based on a recent test, Samyang 135/2 seems to provide sharper, cleaner images with less stray color in out of focus areas. How realistic is that comparison?

This entry was posted in advice requested, camera and lens. Bookmark the permalink.