ive searched the site and found a lot of threads pertaining to this, but they were either out-dated, or had unanswered questions so heres my stab at this.. im shooting with a canon 20d which has a 1.6x crop factor. I want a fisheye, the more distortion the better. I am not a professional. I like to shoot for fun on vacations, trips, and motocross (see avatar?) im looking in the $350-$450 range(would like to stay under 400, but 50 bucks isnt going to stop me) i know there is the peleng 3.5\8mm for around $380 in ebay but it has had mixed reviews (lense cap) and is a manual focus. that isnt a 'deal breaker' for me, but if i can get something else that will give me good distortion\barrel on photos with, or even without af, id rather go with that. ive shot with a sigma 10-22 and was not satisfied when used with my 20d (though i did shoot with a mark-1 and liked it much more) i want a fisheye, not a wide angle. hopefully this fully explains my situation and will help you all, help me! thanks!