An interesting article on what effects dust (or a fly) inside a lens has on image quality. Also, what is involved in disassembly and reassembling a lens to clean it out.
Read the article at Lensrentals
An interesting article on what effects dust (or a fly) inside a lens has on image quality. Also, what is involved in disassembly and reassembling a lens to clean it out.
Read the article at Lensrentals