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09-24-2013, 05:54 PM   #16

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1/80 sec, f2.8, and shooting active children do not mix. You will get softness due to motion blur and lack of depth of field.

Last edited by rawr; 09-25-2013 at 03:06 PM.
09-24-2013, 06:24 PM   #17
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I think it is a combination of subject movement (therefore need high shutter speed) and shallow DOF plus too close to the subject resulting in lack of focus in the picture. It is certainly not indicative that the camera is faulty.
09-25-2013, 03:03 PM   #18

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Another option may be to set the camera to 'P', make sure your auto-ISO is allowed a good range (100-3200 for example), then shoot using LiveView, and make sure 'Face Detection AF' is enabled in the camera menu [Rec Mode 4 -> LiveView -> Autofocus Method] beforehand.

The K-5 doesn't do face recognition using normal viewfinder AF. With the D800, however, if using normal AF and you have 'Auto-area AF' selected, the D800 will give focus priority to a face. The D600 does the same.

For family snapshots I tend to use my NEX-F3 or RX100. Both have fast AF, excellent face detection, and are also smaller and less clumsy around kids, the dining table etc than a big DSLR with lens. Even if I had a D800, I'd still do it that way.
09-25-2013, 03:13 PM   #19
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QuoteOriginally posted by rlatjsrud Quote
My K-5 AF accuracy is really poor... 40%of pics are not focused well. Of course I sent it to PENTAX to fix...

idk about K-5ii2 and K-3, but are those have better AF accuracy??
They don't have the tungsten light issue, but it sounds to me like your AF system just needs to be calibrated, either by you using fine adjustments or in the shop. Remember that each lens should be calibrated as needed, as there are slight variations in the AF accuracy from lens to lens.

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