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11-02-2013, 10:12 AM - 2 Likes   #1
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K-3 AF-C Test Picts

These are some quick OOC JPEGs to test the AF-C on the camera. Images shot with a Sigma 85mm F/1.4 which is an average lens for AF speed. I kept aperture at F/2.8 or F/2 to keep DoF narrow and not give the AF any margin of error. I used the center AF point and on the last shot I was on his chest, not his face. Did not have as much luck with the 9 center AF points, but I probably need more time to play with them. People who shoot action would probably have more success.

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11-02-2013, 10:14 AM   #2
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Does he ride fast ;-)
11-02-2013, 10:19 AM   #3
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QuoteOriginally posted by goubejp Quote
Does he ride fast ;-)
All of those shots were taken in less than .6 seconds. I was on 8.3FPS. The riders were past my position before I could get 8 frames.
11-02-2013, 10:20 AM   #4
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Taken at F/2.8

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11-02-2013, 10:21 AM   #5
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Great results. Was this a fluke or was the behavior consistent with multiple riders?

Edit: I see the second post now. I'm sold.
11-02-2013, 10:27 AM   #6
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Results seem great,I think us Pentaxians are onto something ;-)
11-02-2013, 10:27 AM   #7
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These are on a long paved section where they could get up to full speed.
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11-02-2013, 10:28 AM   #8
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Thanks! The actions shots with the new AF are (for me, anyway) the single biggest reason to upgrade to a k3. It seems the last image of some groups tend to be out of focus - is that the AF or have the passed the minimum focusing distance of the lens?

Keep 'em coming!

11-02-2013, 10:32 AM   #9
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QuoteOriginally posted by crewl1 Quote
Great results. Was this a fluke or was the behavior consistent with multiple riders?

Edit: I see the second post now. I'm sold.
I would say 75-80% keep rate to be conservative. But I might not have had my AF-C setup right.

I had AF HOLD set to HIGH and "Release Priority" set instead of "Focus Priority"

Again these are my first test shots and I don't shoot much action. With the right settings and more experience with this type of shooting I'm sure I could get better results.
11-02-2013, 10:35 AM   #10
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QuoteOriginally posted by innivus Quote
Thanks! The actions shots with the new AF are (for me, anyway) the single biggest reason to upgrade to a k3. It seems the last image of some groups tend to be out of focus - is that the AF or have the passed the minimum focusing distance of the lens?

Keep 'em coming!
I'm shooting most of these at F/2.8 or even F/2 so the DoF is getting really narrow on the 85mm as they get closer. The Sigma 85mm is not know for fast AF speed.

I probably should have been shooting at a higher shutter speed. 1/500 is probably not fast enough.

Last edited by Winder; 11-02-2013 at 10:48 AM.
11-02-2013, 10:38 AM   #11
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They look good to me, in particular for a shooter that is not an "action shooter". If this is indicative of the improvements, it is indeed a very nice result!

Regards!
11-02-2013, 10:53 AM   #12
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Very nice results!

John
11-02-2013, 10:56 AM   #13
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But can it track an army of squirrels?
11-02-2013, 11:08 AM   #14
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lol, im sure rupert will find out soon enough :-P
11-02-2013, 11:55 AM   #15
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That seems pretty great, better than most if not all previous Pentax DSLRs. Of course, a big part of it is the skill of the photographer
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