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Sigma 20mm, f/1.4. I've had this lens for over a year and it's served me well. Got it for cheap, too.
HOWEVER, it has the single worst focus ring I've ever seen, felt, or even heard of. It's awful. Unforgivable, even. It's so stiff that I thought there was something wrong with it until I read up on it more and found out that was just how it was built. I have to actually fight the lens to manually focus, even a year after using it almost every day.
Is there any way to remedy this without buying another lens? Willing to take minor risks.