I went to Walgreens to have some 35mm practice film developed. Only 4 pics developed, and the rest of the negatives didn't look like they took any light at all. Only thing i can think of is that the film didn't advance, but I know for a fact it did. The pics weren't important, but the only other info I can add is that it seems as though the camera isn't focusing correctly. It's a Canon AE-1 that has been in a closet for 15 years, think I should just go ahead and have it cleaned and let them do any calibration it might need? I'm thinking it's an issue with the camera itself, but it's hard to say...?