joema
Active member
I'm looking at the sigma 24-70 f/2.8. Images are pretty, autofocus seems good, nice features.
Fast-moving subjects on a telephoto zoom are another place where it would be nice to have autofocus instead of adapting my canon 70-200 is ii and losing autofocus...
My team has several G-Master 24-70 f/2.8, 70-200 f/2.8, Sony 24-105 f/4 and Canon IS II 70-200 f/2.8 adapted with Metabones to various Sony Alpha cameras. I also use the 28-135 f/4 Power Zoom lens.
The G-Master 24-70 is really nice optically and mechanically but it's expensive and we end up not using them that much for field documentary and interviews. We use the 70-200 lenses a lot. The Canon 70-200 is superb but you don't have usable AF in video, and for stills AF sort of works but I don't trust it. We use MF 95% of the time no matter what the lens, so it's little consequence. Aside from AF, Metabones works fairly well but over several years of shooting in many locations using several copies, it's not quite as reliable as a native lens.
The 24-105 seems like excessive overlap with the 70-200 but we end up using it a lot. It has stabilization, which helps, and the camera has sufficient low light that f/4 is usually OK.
We are getting several A7SIIIs and hopefully AF will be good enough to try on interviews but we are very cautious, esp. for multi-person interviews. I admit I am "old school" and just don't trust video AF most of the time. I've tried it with the A7RIII and 70-200 2.8 G-Master which should be pretty good, and messed up several shots. Like Philip Bloom said to actually trust video AF in a real-world production situation, it must be *very* good, not just 90% good. However I'm optimistic that with the new cameras it will be more usable.
The 28-135 PZ lens isn't optically equal to the Canon or G-Master lenses, but it's pretty good and very flexible. It essentically transforms a mirrorless camera to a more camcorder-like feel.
For us the biggest issue with the A7SIII is losing Super35 mode in 4k. That was expected, but that is was a nice feature and basically gave two focal lengths for each lens, and at no quality cost. We'll test Sony's Clear Image Zoom but that is basically digital zoom and manipulation. You can't create resolution out of thin air, or else they'd use that technique on the Space Telescope and wouldn't need to build a new one.