Title: Sharp and convenient for the money
Review: This 28-105 f3.2 zoom lens is a nice complement to the Pentax 16-45 wide zoom. It is a full frame lens and thus is usable on both digital K10d, K20d, K100 Super, K200d etc. and also on full frame film cameras. Overall, small size and light weight are very convenient. Sharpness is quite good, more than acceptable, but not quite perfect. There were some blue-yellow chromatic aberrations but these were easily corrected in PhotoShop. Build quality seems quite adequate. I compared the images from this lens at optimum aperture and various focal lengths to the highly regarded Pentax FA 50 mm f 1.4 and the DA 16-45 mm f 4. The other lens may have been slightly better when viewed at 200% but 100% crops were virtually indistinquishable. A very good performance for a handy lens, given the low cost.
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