Ah yes! That's what I thought! But where I bought it, it says that it was compatible with the Sony f717 and F828. I also read somewhere that a guy who was using that same lens but with a Canon cam, was having the same prob! He said that it worked fine when he added a filter before adding the lens!! Doesn't make much sense right! I guess I'm going to send it back! Thx for ur help Rich!