Advance design, sturdy, and easy to handle. It came with an f.0.95 lens. Developed for Police survellance, it slipped into the mainstream when a reviewer for a photography magazine discovered it. It was indeed more sensitive than the human eye, but I found limited applications for it, and sold it shortly after buying it. I retained the 35 mm. f.2.8 medium wide angle, and the 100 mm. f.3.5 portrait lenses.