I recently purchased a Vivitar V4000 with kit zoom lens for a total of $25. This camera has a mechanical (Copal Square I believe) shutter and works fine. Obviously, the outer casing is rather cheaply built as this was an extremely low priced mass market item. I do not care about cheap build where it really does not matter. But I was rather dismayed to see that the film rails on each side of the 24 X 36mm film aperture are plastic, not metal. This is similar to the Canon T50 (not actually made by Canon by the way) and I really wonder if I am downplaying the durability of this particular plastic. It seems remote to me that Vivitar would stint on something so important as the camera even has a mechanical timer. Are these plastic rails really so vulnerable to wear as film runs though the camera? - David Lyga.