I just purchased a Nikkor 1:1.8 at ebay. I have a Nikon N50 and when I put the lens on the body the display tells me Err and then a small icon of a lens and CPU underneith. I have checked all possibilities and nothing seem to work. It's an old lens, about 8 years old som it doesn't have any autofocus, which according to Nikon's CS shouldn't be needed! I have tried to take pictures both manually and automatically with the lens but the Err is blinking all the time and stops me from being able to take a picture. Is it possible that my camera isn't supporting this lens? Why would it not be supporting one of the most used lenses available for Nikon? And the second question is as follows. I also got a Close Up 2+ filter. How do I use that and in what situations is it useful? Oh actually I have a third and fourth question now while I'm on it. The filter was pretty dirty. What's the best way of cleaning it? Do I use any kind of liquid? And finally, I also got eight rolls of film. But they were not in the usual black or white tub, but totally uncovered. Is it still ok to put them in the freezer which is where I store my film? And, is there usually an expiration date on the film roll per se? Thanks for your patience!