As far as sharpness goes I think most macro lenses are hard to fault.Tokina AT-X 100 PRO D macro
Tamron 90mm f2.8 macro.
Could you please explain how a firmware upgrade rendered a lens useless?I also had a Sigma macro, but the 180 f3.5, same attributes as the Pentax but rendered useless when D810 firmware was upgraded. Still worked on the D500 but not the D810.
Sure sounds like ignorant engineering to me. I'll stick with what I have, thank you!.Lost all AF functions. It worked fine on the D500, while there were no issues with other lenses on the D810.
Sigma refused to rectify the lens I had because it was an EX and not 'Global Vision' (ie Art/Sport/Contemporary) and I wasn't going to reverse the D810 update.
Sure sounds like ignorant engineering to me. I'll stick with what I have, thank you!.
Sure glad I have no need for autofocus!It's probably more like Sigma can't be expected to take old lenses back and make them compatible with cameras and firmware released years after the lens was made. Unfortunately this is an issue with 3rd party lenses when the lens maker has to back engineer the camera manufacturers AF tech because the camera manufacturer wont supply the lens maker with technical information.
If you look at Nikon their camera/lens compatibility is IMO a minefield even if looking at only Nikon lenses so it's quite easy to understand why a Sigma lens, for example, designed to work on a camera 10 years ago wont work well or at all on a 10 years newer camera with different AF tech and firmware.