A couple of days ago I picked up a second hand Canon EOS 500N with a 28-80mm lens. I've been happily snapping away in macro and portrait modes with no problems, however today I went out to try and grab a few landscape shots and found that in both autofocus and manual focus modes the camera didn't want to take the photo. Instead the shutters closed and stayed closed and the warning that according to the manual means that the pop up flash has been obstructed went off. I tried repeatedly ensuring that the flash was totally capable of opening even though it shouldn't have to but to no avail. Can anyone shed any light on this problem? I'm using ISO 200 film atm as well if that makes any difference. I'm slightly perplexed.