Originally posted by aslyfox so you don't consider the HD Pentax-DA 16-85mm F3.5-5.6 ED DC WR a top quality zoom ??
[...]
I wonder if others have the same opinion of the 16-85mm
I have:
HD Pentax-DA 16-85mm F3.5-5.6 ED DC WR (6 years)
Pentax HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR (3 years)
SMC Pentax-DA 17-70mm F4 AL [IF] SDM (12 years)
I have used the Pentax 16-85mm for 6 years but I have come to the conclusion that my copy is decentred, especially noticeable in the range 60-85mm. That seems to be a problem with many copies of this lens.
The Pentax 20-40mm is the sharpest lens (of these three) at aperture 8 and gives fine images. The Pentax 17-70mm is my favourite lens because of its range and the fine quality images it produces. During a holiday I prefer using a K-3 with the Pentax 17-70mm, but I use a KP with the Pentax 20-40mm when I walk around all day with my camera.
The Pentax 16-85mm is a good lens if you can find a good (i.e. not decentred) copy. On a K-3 there is not much difference between a 17-70mm and a 16-85mm, apart from colour reproduction. I prefer the 17-70mm because of the nice colours it gives.
For the TS: the 20-40mm is a fine lens, worth using and is lightweight compared to the 16-85mm or 17-70mm