DA 16-45 review

klimbkat wrote:

flektogon wrote:

Can I ask you for a favour? My DA 16-45 mounted on the K-x exhibits certain AF problems. For example, if a subject is let's say 2m away, my lens when set to 45mm after focusing shows exact focus distance (i.e. 2m). Now, when I change the setting to 16mm and refocus, the distance scale changes, it shows around 4m (generally twice more). I am sure that this is a camera body problem, as in LV mode the focus distance is always correct and same at any focal length setting. I am just curious whether other Pentax bodies exhibit similar problems.

Regards,

Peter

I tried my 16-45's focus on a K5IIs. Generally the distance (and by this, I assume you mean the distance scale on the lens itself which, in turn, indicates the actual focus point) does not change much when refocusing after changing from wide to tele or back. At closer and farther distances there is some movement, though nothing as large as you describe. Interestingly, at 2M there is essentially no change at all. When your lens changes (refocuses) at 2M are both shots in focus?

Thanks Dough. It has to be a K-x PDAF focusing problem. When the lens is set to wider angles, somehow PDAF unit gets confused, because in the LV mode the lens focuses perfectly at any zoom setting. So, for critically correct focusing I have to focus at the 45mm setting, press the shutter button half, quickly change the zoom setting and then to take exposure.

Regards,

Peter