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DA 16-45 review

Started Jan 18, 2016 | User reviews thread
flektogon
flektogon Veteran Member • Posts: 6,226
Re: DA 16-45 review

kitsios_spyros wrote:

Hi Peter,

I am afraid that if this is the case indeed, then your lens needs servicing. If it is a parfocal lens (more or less) as Dough suggests, then you need different AF-FA adjustment for 16mm vs 45mm. Zoom lens suffer from it all the time. Even if you buy it perfectly calibrated, this problem may develop with use.

If speed is not important, you can use it in live view. For PDAF shooting, calibrate focus for 45mm on your camera(s), focus at 45mm and then zoom-out and recompose while holding AF locked.

Hi Spyros,

Is it possible that the lens would be faulty if it focuses properly in the LV mode? I doubt. I still think that this is a problem of the PDAF in my camera. I have no idea how the back/front focus adjustment works in the Pentax bodies. Is this somehow done by mechanical movement (re-positioning) of the PDAF "unit"? Is it possible to make such adjustments independently for different lens angles? And I doubt that the K-x allows such adjustments at all.

Regards,

Peter

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