Comparison: Yongnuo 50mm f/1.8 vs Canon 50mm f/1.8

Not sure if anyone else has gotten a chance to try out the Yongnuo in colder temperatures, but the AF motor was moving VERY slowly for me. I also had a few shots that came out really over exposed. So much so that I wonder if the aperture diaphragm was stuck open for a few of the shots.

Edit: the temperature was 12F
 
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