<p>I have a Canon AV1 & here is how I would check it. With no film in the camera take the lens off & fire the shutter to see if the mirror works properly. If so open the back to see if the curtains open as they should when the shutter is fired. If that is ok put the lens on & look to see if the blades open at different f stops. If all checks out OK then you must of not loaded the film properly. I've done that & now I wind on to make sure the sprockets & spool grab the film before I close the film door. I really like my AV. so good luck with it</p>
