Tamron A14 for Pentax

The Tamron AF 18-200mm f/3.5-6.3 XR Di II is a versatile, well-rounded lens. The lens produces sharp images at both ends of the 18-200 range. The lens does seem to suffer from slight outward creep, though I have noticed the same problem with the Sigma 18-200mm f/3.5-6.3D DC. The major upside to the Tamron and Sigma 18-200's is their affordability, especially when compared to the Nikon 18-200mm f/3.5-5.6G ED-IF AF-S DX VR II (about $400.00 more on average).

The Tamron lens did leave something to be desired with regard to focus noise, especially after being spoiled by the Nikon's Silent Wave motor. However, the construction of the Tamron lens is probably what bothers me most. The lens has a cheap "feel", being made of lightweight and less durable materials, but one may notice this only after dealing with heavier and bulkier Nikkor lenses. I have read articles stating that the seals on the lens are easily penetrated, though I have had no experience with this problem.

Generally speaking, this Tamron lens is a good product for novice and expert photographers alike, and it won't force you to break the bank. If you are willing to spend some extra cash, I would point you in the direction of the Nikkor lens mentioned above.