K-1 fps in AF-C?

jake14mw · 05-10-2016, 08:54 AM

I know that the Pentax specifications say that the frames per second rating of the K-1 is 4.4. I have not seen anything stating if this goes down when the camera is in AF-C mode. I know with my K-5ii, the specs say 7fps, it tests out at around 6.7 fps in AF-S, but when you move to AF-C, it drops to somewhere in the fours. Is there a similar reduction with the K-1?

I have found in certain sports situations, I have switched to AF-S, to get that high fps.

Adam · 05-10-2016, 09:10 AM

There's a FPS priority setting that will help you realize the maximum framerate even when AF is on. Based on rough testing it looks like the K-1 is able to maintain its max. framerate in AF-C with FPS priority set, though it does pause if excessive AF adjustments are needed. So I guess it ultimately depends on the speed of the lens, what you're shooting, and how good your tracking technique is

jake14mw · 05-10-2016, 12:50 PM

Originally posted by Adam

There's a FPS priority setting that will help you realize the maximum framerate even when AF is on. Based on rough testing it looks like the K-1 is able to maintain its max. framerate in AF-C with FPS priority set, though it does pause if excessive AF adjustments are needed. So I guess it ultimately depends on the speed of the lens, what you're shooting, and how good your tracking technique is

I was thinking that I would not want pictures that were OOF with the FPS setting, but I should try it out. It is only certain situations, and compared to AF-S I would think it might be better.

Not a Number · 05-10-2016, 01:34 PM

Originally posted by jake14mw

I know that the Pentax specifications say that the frames per second rating of the K-1 is 4.4. I have not seen anything stating if this goes down when the camera is in AF-C mode

Huh?
Specifications | PENTAX K-1 | RICOH IMAGING

Quote:

[APS-C size]
Max. approx. 6.5 fps, JPEG ( L: ★★★ at Continuous H): up to approx. 100 frames, RAW: up to approx. 50 frames
Max. approx. 3.0 fps, JPEG ( L: ★★★ at Continuous M): up to approx. 100 frames, RAW: up to approx. 70 frames
Max. approx. 1.0 fps, JPEG ( L: ★★★ at Continuous L): up to approx. 100 frames, RAW: up to approx. 100 frames
*ISO100

Cannikin · 05-10-2016, 02:11 PM

Originally posted by Not a Number

Huh?

Note he said "AF-C" as in "autofocus continuous", not "APS-C".

jake14mw · 05-11-2016, 10:25 AM

Originally posted by Cannikin

Note he said "AF-C" as in "autofocus continuous", not "APS-C".

Yes, thanks. If anyone who has a K-1 can confirm that they get the same framerate whether in AF-S or AF-C, I would appreciate that.

jake14mw · 12-04-2018, 09:59 AM

Ha, I came to the forum today to post this question. When I did a search on it, I found my own post from 2 years ago that was never answered. I hope someone knows the answer now.

derekkite · 12-05-2018, 01:14 PM

The Mark II doesn't slow down in AF-C. I'm not sure about the K1.

stevebrot · 12-05-2018, 01:57 PM

Originally posted by jake14mw

Yes, thanks. If anyone who has a K-1 can confirm that they get the same framerate whether in AF-S or AF-C, I would appreciate that.

Originally posted by jake14mw

I hope someone knows the answer now.

Based on Adam's comment above, AF-C (FPS priority) may pause if a lot of AF action is needed. AF-S (focus priority) should simply fire the burst once lock is attained. I suspect that AF-S (release priority) may also pause during the burst, though it is hard to say. Such has not been my experience with the K-3, though the K-1 may be different.

Steve

MarkJerling · 12-05-2018, 04:04 PM

Now I'll have to go do a test with the K-1ii and see how fast. Give me a few days and I'll report back.

jake14mw · 12-06-2018, 08:31 AM

Originally posted by MarkJerling

Now I'll have to go do a test with the K-1ii and see how fast. Give me a few days and I'll report back.

Thanks very much. i do some sports shooting, so under 4.4 fps in AF-C would be limiting.

derekkite · 12-06-2018, 01:44 PM

The k1 Mark 2 doesn't slow down if you hold the shutter and the af button. It is faster than the K3 in both modes when the shutter and af button are depressed.

rawr · 12-06-2018, 02:11 PM

Imaging Resource did test fps in their K-1 and K-1 II reviews, but not running AF-C:

Pentax K-1 Review - Performance

Pentax K-1 II Review - Performance

Both ended up showing 4.5 fps in RAW on Continuous H. Most times anyone shooting in AF-C will also be in Continuous H drive mode, so that gets you pretty close to learning AF-C performance vs AF-S.

Perhaps the CIPA standard for testing fps may not include shooting in AF-C mode, so that might explain why specs for AF-C performance are hard to come by. But AF-S vs AF-C on a static test chart shooting the same focussing area (eg centre point or even Auto 33) shouldn't show much difference.

MarkJerling · 12-09-2018, 12:26 AM - **1 Like**

Originally posted by jake14mw

Thanks very much. i do some sports shooting, so under 4.4 fps in AF-C would be limiting.

I have now tested the K-1ii under the following conditions:

AF-C: Shooting RAW.
AF-C: Shooting JPG.
AF-S: Shooting RAW.
AF-S: Shooting JPG.

I can confirm that my K-1ii will give 4-5 shots per second for AF-S and AF-C, RAW or JPG. There does not appear to be any measurable difference for either AF-C or AF-S, nor for RAW vs JPG. The buffer does fill faster when shooting RAW though.

rawr · 12-09-2018, 01:04 AM

4-5 shots/second in AF-C makes K-1 exactly equal to the other 36MP full-frames out there with probably the same sensor - the A7R (4fps) and the D800/D810 (4/5 fps).

05-10-2016, 08:54 AM	#1
jake14mw Veteran Member Join Date: Jan 2008 Location: Connecticut, USA Posts: 977	K-1 fps in AF-C? I know that the Pentax specifications say that the frames per second rating of the K-1 is 4.4. I have not seen anything stating if this goes down when the camera is in AF-C mode. I know with my K-5ii, the specs say 7fps, it tests out at around 6.7 fps in AF-S, but when you move to AF-C, it drops to somewhere in the fours. Is there a similar reduction with the K-1? I have found in certain sports situations, I have switched to AF-S, to get that high fps.

05-10-2016, 09:10 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,593	There's a FPS priority setting that will help you realize the maximum framerate even when AF is on. Based on rough testing it looks like the K-1 is able to maintain its max. framerate in AF-C with FPS priority set, though it does pause if excessive AF adjustments are needed. So I guess it ultimately depends on the speed of the lens, what you're shooting, and how good your tracking technique is Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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05-10-2016, 12:50 PM	#3
jake14mw Veteran Member Join Date: Jan 2008 Location: Connecticut, USA Posts: 977 Original Poster	Originally posted by Adam There's a FPS priority setting that will help you realize the maximum framerate even when AF is on. Based on rough testing it looks like the K-1 is able to maintain its max. framerate in AF-C with FPS priority set, though it does pause if excessive AF adjustments are needed. So I guess it ultimately depends on the speed of the lens, what you're shooting, and how good your tracking technique is I was thinking that I would not want pictures that were OOF with the FPS setting, but I should try it out. It is only certain situations, and compared to AF-S I would think it might be better.

05-10-2016, 01:34 PM	#4
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,525	Originally posted by jake14mw I know that the Pentax specifications say that the frames per second rating of the K-1 is 4.4. I have not seen anything stating if this goes down when the camera is in AF-C mode Huh? Specifications \| PENTAX K-1 \| RICOH IMAGING Quote: [APS-C size] Max. approx. 6.5 fps, JPEG ( L: ★★★ at Continuous H): up to approx. 100 frames, RAW: up to approx. 50 frames Max. approx. 3.0 fps, JPEG ( L: ★★★ at Continuous M): up to approx. 100 frames, RAW: up to approx. 70 frames Max. approx. 1.0 fps, JPEG ( L: ★★★ at Continuous L): up to approx. 100 frames, RAW: up to approx. 100 frames *ISO100

05-10-2016, 02:11 PM	#5
Cannikin Veteran Member Join Date: Mar 2010 Location: SW Washington Posts: 833	Originally posted by Not a Number Huh? Note he said "AF-C" as in "autofocus continuous", not "APS-C".

05-11-2016, 10:25 AM	#6
jake14mw Veteran Member Join Date: Jan 2008 Location: Connecticut, USA Posts: 977 Original Poster	Originally posted by Cannikin Note he said "AF-C" as in "autofocus continuous", not "APS-C". Yes, thanks. If anyone who has a K-1 can confirm that they get the same framerate whether in AF-S or AF-C, I would appreciate that.

12-04-2018, 09:59 AM	#7
jake14mw Veteran Member Join Date: Jan 2008 Location: Connecticut, USA Posts: 977 Original Poster	Ha, I came to the forum today to post this question. When I did a search on it, I found my own post from 2 years ago that was never answered. I hope someone knows the answer now.

12-05-2018, 01:14 PM	#8
derekkite Pentaxian Join Date: Sep 2011 Location: Nelson B.C. Posts: 3,782	The Mark II doesn't slow down in AF-C. I'm not sure about the K1.

12-05-2018, 01:57 PM	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by jake14mw Yes, thanks. If anyone who has a K-1 can confirm that they get the same framerate whether in AF-S or AF-C, I would appreciate that. Originally posted by jake14mw I hope someone knows the answer now. Based on Adam's comment above, AF-C (FPS priority) may pause if a lot of AF action is needed. AF-S (focus priority) should simply fire the burst once lock is attained. I suspect that AF-S (release priority) may also pause during the burst, though it is hard to say. Such has not been my experience with the K-3, though the K-1 may be different. Steve

12-05-2018, 04:04 PM	#10
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,402	Now I'll have to go do a test with the K-1ii and see how fast. Give me a few days and I'll report back.

12-06-2018, 08:31 AM	#11
jake14mw Veteran Member Join Date: Jan 2008 Location: Connecticut, USA Posts: 977 Original Poster	Originally posted by MarkJerling Now I'll have to go do a test with the K-1ii and see how fast. Give me a few days and I'll report back. Thanks very much. i do some sports shooting, so under 4.4 fps in AF-C would be limiting.

12-06-2018, 01:44 PM	#12
derekkite Pentaxian Join Date: Sep 2011 Location: Nelson B.C. Posts: 3,782	The k1 Mark 2 doesn't slow down if you hold the shutter and the af button. It is faster than the K3 in both modes when the shutter and af button are depressed.

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12-06-2018, 02:11 PM	#13
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Imaging Resource did test fps in their K-1 and K-1 II reviews, but not running AF-C: Pentax K-1 Review - Performance Pentax K-1 II Review - Performance Both ended up showing 4.5 fps in RAW on Continuous H. Most times anyone shooting in AF-C will also be in Continuous H drive mode, so that gets you pretty close to learning AF-C performance vs AF-S. Perhaps the CIPA standard for testing fps may not include shooting in AF-C mode, so that might explain why specs for AF-C performance are hard to come by. But AF-S vs AF-C on a static test chart shooting the same focussing area (eg centre point or even Auto 33) shouldn't show much difference.

12-09-2018, 12:26 AM - 1 Like	#14
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,402	Originally posted by jake14mw Thanks very much. i do some sports shooting, so under 4.4 fps in AF-C would be limiting. I have now tested the K-1ii under the following conditions: AF-C: Shooting RAW. AF-C: Shooting JPG. AF-S: Shooting RAW. AF-S: Shooting JPG. I can confirm that my K-1ii will give 4-5 shots per second for AF-S and AF-C, RAW or JPG. There does not appear to be any measurable difference for either AF-C or AF-S, nor for RAW vs JPG. The buffer does fill faster when shooting RAW though.

12-09-2018, 01:04 AM	#15
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	4-5 shots/second in AF-C makes K-1 exactly equal to the other 36MP full-frames out there with probably the same sensor - the A7R (4fps) and the D800/D810 (4/5 fps).