Wow m4n, I'm pretty surprised to hear that.
Looking at the MTFs I figured it was only a small improvement over the EF, which wasn't great. I bought one anyway for size, and mine seems to be just excellent. I have NO explanation for the following fact, as an engineer, and I'm embarrassed to say that, but
the secret of hand-holding the RF50/1.8 is you have to shoot it at 1/2 to 1/30. Taking 10 shots at each shutter speed, I found the
worst shot at each of the speeds from 1/2 to 1/30 inclusive was
better than the
best shot I got above 1/30.
That somehow might be a factor of my copy of the lens or the way I hand-hold. It's so surprising I should perhaps repeat the test...
See my other posts for details of the goals and methodology. But in short, these targets are 1:1 selections from laser printer-printed targets under household incandescent, hand-held in a seated position. The selections are sorted, for each shutter speed, from sharpest to least sharp. A...
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