Quantaray CP on my XTi with the kit lens. Minus the fact I fuxored the lighting on this shot, it brings out a problem I've noticed since using it. There's a purple/blue ring that seems to surround the entire picture. Is it just because the CP is cheap or is there another issue going on I need to be clued in on? It's not bad when it's blown up to desktop size, but the smaller the image gets, the worse that funky ring of color around the edges becomes apparent. I only picked it up because it was like $35 flippin' bucks and I was on a shopping spree at a big local mall. I'll buy something fancier if this problem is merely because it's a Quantaray. Thanky.