Hey guys, I have some lens questions for ya'll. First off, I have a 70-200 f/5.6 k-mount manual lens. When I look through my viewfinder with this lens on, it looks like the glass it looks dirty. So, I get out my lens cloth and rub away, but it is still dirty. Upon further inspection, I see little white spots, but they're on a secondary glass, just inside the one that i can clean. Is there any way to take this thing apart so I can clean that lens, or do I have to send it off? Also, I've been looking at lenses on eBay. On several of them I see that they will say something like 'there is some dust on this lens, but it does not show on the picture'. Does this mean that it is inside the lens, and I won't be able to clean it? Also, should I trust them when they say that it doesn't affect the image quality? Thanks for your help!