My compliments to Crystalvue makers. This is a great product and well worth the price. One must learn to focus for the effects you want but it works simply enough, just make test shots at first. One con and not a detraction from lens is using a UV filter and getting proper focus. I am not sure if this is because of the cvamera focusing specs or what but I am definaltely having problems focusing with the addition of a UV filter .... no other problems though.