i've got a problem, it seems that the apature(sp?) on my lens doesn't work anymore. i have no idea what caused this and i know it's not the lens because ive tried 2 different ones and theirs don't work either, the light meter just stays where it is. it doesnt seem to be the light meter either, since it still works but it's just not affected by the apature. if anyone knows what the deal is then let me know