The autofocus adjustment will only alter the relationship of the lens to the 
focal plane. In other words, you can't choose to adjust one end of the focal 
length range and not the other. I don't own that lens, so I can't tell you if 
it's a problem on my camera, but my DA 16-45 and DA 50-200 seem to focus just 
fine. I will, however, try to duplicate what you describe here later today.  
I'm not sure I've attempted a shot at infinity.
Paul

 -------------- Original message ----------------------
From: jtainter <[EMAIL PROTECTED]>
> When I mount the DA* 16-50 F2.8 on the K20D and focus on something far away, 
> the 
> autofocus will move the focus point to just short of the 2 m. mark. It won't 
> focus to the infinity mark. If I manually focus to infinity, distant parts of 
> a 
> scene noticeably sharpen up. If I zoom to 50 mm, the lens autofocuses to 
> infinity just fine.
> 
> The lens works just fine on my K10D.
> 
> Does anyone know if/how the K20D's autofocus adjust works for zoom lenses 
> that 
> focus correctly at one end of the zoom range, but not at the other end?
> 
> I suspect that I have a defective K20D, and that I have to send it to Pentax.
> 
> Thanks,
> 
> Joe
> 
> 
> 
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