Ephotozine has recently published their review on Pentax SMC 50-200mm f/4-5.6 DA ED, a telephoto zoom lens with an angle of view 31.5-8.1º, a min aperture of f/22 – 32.
” Despite its small size and low weight, this lens performs more than adequately. The focal range is ideal as a second lens on the cropped sensors of the cameras that it is designed for. (*istDxx range) Autofocus is perhaps a little dated and often has a last tiny jerk to acquire its final lock but is accurate once it is there. Pentax have done well to achieve such pleasing performance in such a small package for what is a very reasonable price.
In summary, the positive points of the Pentax SMC 50-200mm f/4-5.6 DA ED lens are:
Lightweight and compact, Consistent optical quality throughout range, Good value for money
The negative points are: Chromatic aberrations under some conditions, Autofocus a little frustrating at times, Manual focus ring small and rotates during AF”