The product build quality is out standing. Sigma will always shine in this area. The quality of the lens is also great. I feel that the lens is a bit large and heavy tho.
I love this len , actually is not that big, of course if you compare with canon 50 mm 1.4 is big but still ok for me, sharp len, only dowside is video auto focus, hope they can update firmware to fix this problem
Very nice lens. Sharp in center and edges. Sturdy build
This sigma glass is tack sharp at 1.4. Not soft. Build quality is great. Auto focus in af-c is pretty fast for non Sony lens. Its not g master fast. Anyone who used a g master lens will know it locks on focus in an instant. The sigma doesnt (tbh i didnt expect it to be instant). I did notice slight lag and at times it seems to freeze up the auto focus system in my a7 r iii. Eye af works great. It does nail the focus. This lens seem to have auto focus issues in af-s mode. It hunts a lot in this mode. If you are going to shoot a lot of af-s, this lens isnt for you. Otherwise af-c works great with very little hunting back and forth. I also noticed I would get random flickering for some reason when I use this lens. It didnt matter if it was good or bad lighting. Not sure why?. Didnt get this flickering using the Sony glass or adapted Canon glass (with mc-11 adapter) shooting in same conditions. Wasnt very heavy. Feels pretty balanced. I thought it was going to be a lot heavier and bigger from what I read. Giving 2 stars mainly because of af issues and flickering. 10/12/18 update I just updated to the new version 2 update for A7r iii. It fixed a lot of the hunting/af issue I was having. Single point af is a lot better. Still hunts but ALOT less. It went from like 2-3 seconds to like 1 second. Auto focus is now on the same level with the g master or very close to it. GIving it 4 stars instead of 2 now.
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