Let's just say that either measured or shown by example, the distortion
at wide end makes this lens a no-go for me.
Boris
Subash wrote:
http://www.photozone.de/pentax/405-pentax_1650_28
<quote>
Verdict
It is difficult to find a final verdict for the Pentax SMC DA* 16-50mm
f/2.8 ED [IF] SDM. On the one hand it has some obvious problems like a
weak border performance at max. aperture and very pronounced lateral
chromatic aberrations (CAs). On the other hand it is really very sharp
and contrasty at medium aperture settings (f/5.6-8) and many users may
actually forgive the border problems at f/2.8 because you either stop
down for conventional photography or rely on the (very sharp) center
for shallow depth-of-field situations (e.g. portraits) anyway. The
build quality of the lens is also a step up from the consumer grade
Pentax lenses and the silent (although not overly speedy) SDM is an
extra bonus on top. The pricing of the Pentax 16-50mm f/2.8 is fair
relative to its performance and build quality.
</quote>
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