Review on Fotodiox Lens Mount Adapter Pentax by Ashley Chaney

This lens adapter looks well made and feels solid in my hand, but every shutter lens I put on it doesn't work properly, more specifically, the aperture can't work in full range - I can only move it from wide open to about 50% closed, about f/8 or so depending on what lens I'm using. three shutter lenses, two from Sears and a Star-D (probably all from Samyang), and they all work the same way. Upon closer inspection, it turns out that the shutter sleeve, which is supposed to rotate around the mount on the camera, only rotates a little before synchronizing and stops rotating. If I really get my hands on it and rotate it a little more I can get a little more range out of the aperture, but only a stop or two and never gets close to f/22. All three of these shutter mount lenses work great with my AE-1 and the ring rotates a lot more when attached to this camera. I have a Canon branded lens with a bayonet mount and it works well with this adapter which allows the aperture range without issue. The difference is that it doesn't have a rotating ring to sync the lens to the camera mount. My guess is that there is a machining tolerance that wasn't set properly when the adapter was manufactured, probably only a few thousandths. inches, but still enough. I'm unhappy that this only seems to work properly with bayonet mount lenses when the instructions say it works with this lens and mount lenses. I haven't seen anyone mention this guy. Problems, maybe I just have a bad adapter?