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05-20-2015, 03:55 PM   #1
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Trouble with autofocus- setting recommendations

I just bought my first auto focus lens (a DA 40mm 2.8 limited)

I normally shoot manual focus lenses but wanted an auto for shooing my daughter who is always on the move- making quickly focusig hard.

I tried all of the options for autofocus (5 point, 11 point- dont't have the camera in front of me, so going memory there) but when using it pretty much always picks a central point.

If I have to play around with multiple halfway shutter presses to get the focal point I want I don't see the need for an auto lens :/

Any tips about what autofocus settings you find work well on the K-r?

05-20-2015, 04:06 PM   #2
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I'd go with the central point (spot AF). Pentax's multi-point AF system is still basically in its infancy compared to other implementations, but it does work well with a single point.

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05-20-2015, 04:08 PM   #3
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Thanks, do you frame up in center, half release shutter then reframe with that method?
05-20-2015, 04:25 PM   #4
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QuoteOriginally posted by VBW Quote
Thanks, do you frame up in center, half release shutter then reframe with that method?
Yup. It's commonly known as focus-recompose if you wanted to research it in other threads- there should be plenty here on the forum.


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05-20-2015, 04:59 PM   #5
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Awesome, thanks!
05-20-2015, 05:23 PM   #6
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QuoteOriginally posted by Adam Quote
Yup. It's commonly known as focus-recompose if you wanted to research it in other threads- there should be plenty here on the forum.
I've actually had a number of shots be slightly off with focus-recompose with a wide aperture. If you change the angle to get the center point on the spot you want, the distance will be different in your recomposition. When you have narrow DoF, this means you may be quite a bit off because the focus was 100% to begin with. I find it better to select the point manually. Only downside is that it takes a bit longer but I've had a bit better luck with it.
05-20-2015, 08:01 PM   #7
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Yeah, after more playing with it- I am more accurate with the focus with manually focus than I am with focus- recompose. So I think I'll be selling this lens off (just have to get another 40mm or a 35mm to replace it first.)

Back to the older lenses I go!
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