Mine arrived today - two week delivery. Fits on OK, but it is loose radially (???). It doesn't spin on tight - you can keep spinning it back and forth. Since it's not going side to side, up/down or changing the focal length, it really doesn't matter much for my bellows work. It would probably work using it with a standard lens also, but it is an indication of poor quality. Also, I can only focus out to about 5 or 6 feet with just a lens using this no-glass model - long ways from infinity. - TF