10 out of 10 points and recommendedbuild quality, sharp, wide, low CAon pentax no HSM, not available the MF while in AF mode
As I bought this lens to my Pentax K10D, I was surprised by the sharpness. It's better than the manual prime lens I own. The color reproduction is great on this lense. With the low amount of CA I'm also very pleased. The focussing is quite quick and exact.reviewed July 23rd, 2008 (purchased for $470)
However, the Pentax version doesn't have the HSM motor and you cannot use the MF ring while in AF mode.
Generally for the price I gave for it, this is really a great value youl'll get and actually till now it's the best lense I own.
8 out of 10 points and recommendedOptical quality, build quality, focus rangeslow AF
I replaced old Pentax F 100-300 4,5-5,6 with this new Pentax 55-300. The optical quality is very nice also on 300mm , low CA, good in backlight, but the AF speed is very slow even in comparison with the old Pentax 100-300.reviewed August 25th, 2009 (purchased for $300)
Anyway I like this lense for the great focus range and optical quality.