I know everyone loves the lens. I do too. But when I first got it I felt like wow this feels so flimsy!! But man does it take some sharp shots! When the light gets a little lower, manual focus is faster then auto focus since sometimes it tries to hunt for focus.
My new lens should be here today or tomorrow...man I hate living at an APO, tracking numbers don't exist haha.
My 50mm has that same sized spec on the very same spot. Coincidence?
If it weren't for noticing it while cleaning it one day, I would have never noticed it. It doesn't show up on any of my pics. I also ran a test and took shots in different apertures on different solid colored objects to see if I could find it but never did. I never returned it and I don't regret not doing so since up til this day the spec of dust won't appear in any images.