K-3 AF-C Test Picts

Winder · 11-02-2013, 10:12 AM - **2 Likes**

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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goubejp · 11-02-2013, 10:14 AM

Does he ride fast ;-)

Winder · 11-02-2013, 10:19 AM

Originally posted by goubejp

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.

Winder · 11-02-2013, 10:20 AM

Taken at F/2.8

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**crewl1** · 11-02-2013, 10:21 AM

Great results. Was this a fluke or was the behavior consistent with multiple riders?

Edit: I see the second post now. I'm sold.

mamethot · 11-02-2013, 10:27 AM

Results seem great,I think us Pentaxians are onto something ;-)

Winder · 11-02-2013, 10:27 AM

These are on a long paved section where they could get up to full speed.

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innivus · 11-02-2013, 10:28 AM

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!

Winder · 11-02-2013, 10:32 AM

Originally posted by crewl1

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.

Winder · 11-02-2013, 10:35 AM

Originally posted by innivus

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.

Rupert · 11-02-2013, 10:38 AM

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!

PALADIN85020 · 11-02-2013, 10:53 AM

Very nice results!

John

**jac** · 11-02-2013, 10:56 AM

But can it track an army of squirrels?

buttons · 11-02-2013, 11:08 AM

lol, im sure rupert will find out soon enough :-P

Na Horuk · 11-02-2013, 11:55 AM

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

11-02-2013, 10:35 AM	#10
Winder Veteran Member Join Date: Apr 2010 Location: Tennessee Posts: 6,617 Original Poster	Originally posted by innivus 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.

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11-02-2013, 10:14 AM	#2
goubejp Veteran Member Join Date: Oct 2007 Location: France Photos: Albums Posts: 804	Does he ride fast ;-)

11-02-2013, 10:19 AM	#3
Winder Veteran Member Join Date: Apr 2010 Location: Tennessee Posts: 6,617 Original Poster	Originally posted by goubejp 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, 10:21 AM	#5
crewl1 Site Supporter Join Date: Jul 2010 Location: Los Angeles, CA Photos: Gallery \| Albums Posts: 9,807	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
mamethot Veteran Member Join Date: Jul 2012 Location: Greater Montreal Area Posts: 736	Results seem great,I think us Pentaxians are onto something ;-)

11-02-2013, 10:28 AM	#8
innivus Site Supporter Join Date: Dec 2011 Location: Bronx NY Posts: 340	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
Winder Veteran Member Join Date: Apr 2010 Location: Tennessee Posts: 6,617 Original Poster	Originally posted by crewl1 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, 10:38 AM	#11
Rupert Veteran Member Join Date: Sep 2006 Location: Texas Photos: Gallery \| Albums Posts: 25,123	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
PALADIN85020 Veteran Member Join Date: Sep 2010 Location: Arizona Photos: Gallery \| Albums Posts: 442	Very nice results! John

11-02-2013, 10:56 AM	#13
jac Loyal Site Supporter Join Date: Dec 2010 Location: Clyde River, Nunavut, Canada Posts: 2,364	But can it track an army of squirrels?

11-02-2013, 11:08 AM	#14
buttons Senior Member Join Date: Jul 2010 Location: Grand Rapids Photos: Albums Posts: 193	lol, im sure rupert will find out soon enough :-P

11-02-2013, 11:55 AM	#15
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	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