Robert Lepard wrote: >The focus motor runs the lens >through the focus ranges of the camera but just won't lock. This is all >tried in bright sunlight with a very contrasty subject and other lenses >work just fine. I might mention also that the scene through the viewfinder >is very dark as if I'm viewing the image in stopped down mode (which I'm >not)... Hi Robert...it sounds as though you *are* viewing in stop-down mode, even if you didn't do it. Have you looking through the lens, off-camera to make sure the lightway is unobstructed, and tried 'twanging' the stop-down lever on the back to see that the aperture is moving freely? The only thing I can think of that would give you a dark image when you look through the camera is that the lens is, somehow, stopped down. This would explain the focus-hunting too... Best Wishes, Paul Visit my Website at: http://www.paulbrad.demon.co.uk