The AP does a fine job in not fogging frames. I've yet to lose a picture, only about an 1/8" of exposed film outside of the cassette. Hand rolling film in the dark offers to many opportunities for disaster for someone as clumsy as me. The loader is loaded in the dark and then pretty fool proof. Don't over fill cassettes in fact one nice thing is to load short rolls, so changing out for different films of developing contitions.