I was shocked when I received back my roll of Kodak TMAX400 from Fotohub, it turns out that almost all my frames were not exposed at all, except for a tiny small bit in frame two. Sigh. I've examined the shutter unit of my EOS 500, it still opens/closes and does not jam. The 50mm f/1.8 worked fine on my 300D too. This is the third time I've been shooting film with the EOS 500 and the first two rolls of Kodak Gold 200 turned out just fine. So I was wondering what could have caused almost ALL 36 exposures to be totally not exposed?