Today I tried to look through my 75mm f1.8 while lighting its inside with a flashlight, and I noticed a LOT of tiny shiny particles in the lens that appear to be floating. Prior to this finding, I always thought lens dusts are tiny dark spots that are visible when you look through the lens to a piece of white paper, at least that's how I identify them. I got worried because I've only owned the lens for 3 days, so I check all my other lenses only to find the same result! But those other lenses are relatively old, 12mm f2 and 60mm macro. Also my 60mm macro has 2 dark dusts that are visible no matter how you look at them, and they are indeed not the same as these shiny ones. Yea... my only weather sealing lens. However when you look at anything not as bright, such as a piece of paper, they are not visible at all. I've attached some pictures taken at various angles to show these "dust", but there are actually a lot more if I change the focus distance, this is just 1 "layer" of them. The back lens cap was attached when I shot these pictures. Can anyone else confirm this?