Originally posted by Mikesul I do not see the need for this lens. It is range improvement over the da* 16-50 but it does not seem to have the IQ specs of that lens. Maybe I am missing something.
It's not meant to improve on the DA*, but on the DA 18-55 and/or the DA 18-135. It's a very interesting upgrade option for those with the 18-55 kit as it offers:
1) 16 mm wide-angle over 18 mm, which is quite a noticeable improvement for landscapes
2) 85 mm over 55 mm, gets you a bit closer
3) DC focussing - silent, better for WR because it's internal and possibly even faster
4) HD coating for better flare resistance
5) most
likely better overall image quality, sharpness, resolution, corner sharpness etc.
The DA 18-55 II kit was released in late 2009 alongside the K7 which featured a 14 MP sensor. I think it only makes sense that Pentax has to up the ante with the DA zoom lenses for the K3's 24 MP sensor, so I'd be surprised if the 16-85 would
not offer much better sharpness and resolution than the 18-55 and most likely also at least slightly better than the 18-135 - even though it has a smaller focal range it is larger and heavier than the 18-135.
If Pentax delivers everything I've listed above (and obviously only the fifth point is unsure), then I definitely see a market for this lens and I myself am definitely considering it.