Hello, I was shooting about a year with Mamiya C330f and 80/2.8 lens (black version). A while ago I bought Contax 35mm system for fast shooting purposes. The quality of prints from Zeiss lenses impressed me a lot and I began small "research" about real performance that my Mamiya can produce. I picked up and read carefully an excellent Barry Thornton's book "Edge of Darkness: The Art, Craft, and Power of the High-Definition Monochrome Photograph". The book impressed me so much and made me in half a year change my technique. Now I'm shooting almost always on tripod and developing my HP5+ films in Perceptol 1:2. However I began to notice that my prints (and negatives) are not sharp. I read a lot about Mamiya C330 lenses and most agree that they have very good performance. I checked almost everything that can affect my negatives sharpness. Except the 80/2.8 lens. What a fool I was! After checking taking lens through the light I found out that there's a big amount of dust inside it. Can this affect the sharpness and overall performance of the lens dramatically?