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05-10-2016, 08:54 AM   #1
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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
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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

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05-10-2016, 12:50 PM   #3
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QuoteOriginally posted by Adam Quote
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
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QuoteOriginally posted by jake14mw Quote
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
QuoteQuote:
[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
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QuoteOriginally posted by Not a Number Quote
Huh?
Note he said "AF-C" as in "autofocus continuous", not "APS-C".
05-11-2016, 10:25 AM   #6
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QuoteOriginally posted by Cannikin Quote
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
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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
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The Mark II doesn't slow down in AF-C. I'm not sure about the K1.

12-05-2018, 01:57 PM   #9
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QuoteOriginally posted by jake14mw Quote
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.
QuoteOriginally posted by jake14mw Quote
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.


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12-05-2018, 04:04 PM   #10
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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
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QuoteOriginally posted by MarkJerling Quote
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
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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.
12-06-2018, 02:11 PM   #13
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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
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QuoteOriginally posted by jake14mw Quote
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
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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).
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