Tamron AF Aspherical 28-300mm f3.5-6.3 (model 185D) for Pentax KTamron AF Aspherical 28 300mm f3. 5 6. 3 (model 185D) zoom lens for Pentax K mount SLRs. This lens can be used on almost any K mount SLR, from the earliest manual focus models to the newest digital ones so if you're looking for an "all purpose" lens and you've got a Pentax camera, there's a pretty decent chance that this one will do the trick. In very good condition.