... This lens has exceeded my expectations. For about $70 my hopes for quality weren't too high. When the lens arrived the barrel connecting the optical component section the the T-adapter was loose. A simple fix; I tightened it. When mounting the T-adapter, the scales on the lens barrel ended up on the bottom of the lens when fixed to the camera body. Another easy fix: loosen the adapter mount with a jewelers screwdriver and rotate the lens barrel until the scales are on top where they belong.
Optically the lens performs well. The aperature is set with one adjusting ring. Focus is set with the f-stop wide open to get the brightest image. Once focused the lens is stopped down to the desired aperature with a second adjusting ring. Simple.
A word about focusing. I also bought an Opteka 500mm mirror lens. The 500mm preset lens is much!!!! easier to focus than the mirror lens because the depth of field is so much greater.
The lens is light weight and seems well built. Just remember it's a $70 lens and not a $700 lens.
The pictures I've taken have nice contrast and are reasonably sharp if you take the time to focus carefully. This is a manually operated lens so you'll have to do some searching through your camera menus to set up your system to get properly exposed pictures. I use a K100d body and the set up wasn't difficult. That's it. I hope this was some help if you're considering this lens. ...
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