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I have the EOS M50 with the 15 -45mm lens.  Clicking the release and turning the ring unlocked the lens.  However, when I go to re-lock, the lens collar does not rotate all the way back into the lens body.Any suggestions on what I may be doing wrong?

I have the EOS M50 mark 2.  I need to photograph artwork with a lot of glitter, shine, and hightlights.What manual settings will help pick up this detail?  Samples below are resin painting photographed with an iPhone 11 Max. Each sample has a lot mor...