Nikon F Lens Mount to Pentax K Camera Mount

Fits my SIGMA sd Quattro!

Although Pentax K and SIGMA SA are slightly different, this fits extremely snugly into my SIGMA sd Quattro. Exactly what I was looking for to expand the amount of options I have access to beyond just SIGMA SA.

Nikon lens to Sigma (Pentax K)!!

Sturdy, well machined and solid. Allows my manual Nikon lenses to be mounted on the Sigma SD Quattro (Pentax K mount) with no problem, and they do focus to infinity. Although this usage is highly specific I do recommend for Sigma users.