I saw a similar point in your review, and I was a bit surprised. What exactly is wrong with the Canon 40mm in your experience?TWI by Dustin Abbott said:I'm actually ditching the 40mm f/2.8 STM for a Voigtländer 40mm f/2 since the Canon doesn't seem to like DPAF (on any of my DPAF cameras).
I find that it works quite well on my M5. Sure, the focus is slow, but not unusably so. And more important, it is decisive (no hunting), and accurate. Not for use on anything that moves too fast, but otherwise perfectly appropriate. I don't see a big difference in performance between the 40mm and the 50mm STM. I use the latter much more frequently juste because I prefer the focal length, but performance wise I would be happy with both.
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