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05-10-2014, 10:52 PM   #1
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UHS Memory card & burst rate

I use regularly High continuous burst rate and I would like to hear from K-3 owners using regularly this mode.

I did some limited tests in continuous shooting (H) and I achieve 7 fps with a UHS-I card:
7 fps with JPEG file L* & Sandisk ExtremePro 95 Mb/s 8Gb

Edit: The settings were AF.S, with a DA15mm Ltd and I shot between 10 to 25 shots per burst.

I noted that the Imaging Resource tests were very close to my own results in continuous shooting (H)
7.07 fps with Large/Fine JPEG & SanDisk Extreme Pro 95MB/s UHS-I SDHC card (for up to 75 frames)
7.12 fps with RAW DNG & SanDisk Extreme Pro 95MB/s UHS-I SDHC card (for up to 25 frames)

In comparison, the DPreview tests claimed a higher burst rate with a Class 3 (UHS-II) card in continuous shooting (H):
8.8 fps with Large/Fine JPEG & SanDisk Extreme Pro UHS-3 SDXC card (for up to 68 frames)
8.9 fps with RAW DNG & SanDisk Extreme Pro UHS-3 SDXC card (for up to 23 frames)

I found interesting that my limited results compare closely with the tests of Imaging.resource. They differ from Pentax specs and PF in-depth review and DPR review.

Has anyone compared the burst rate of the K-3 with UHS-I and UHS-II cards?

Have any one had any problem with the UHS-II cards?

Thank you in advance for your input.


Last edited by hcc; 05-11-2014 at 01:25 AM.
05-10-2014, 11:28 PM   #2
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The K3 doesn't have the hardware for uhs ii, so that shouldn't make a difference. Perhaps AF delays were to blame in your case?

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05-11-2014, 12:03 AM   #3
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The burst rate should not change, regardless of what type of SD card is inserted - the data is going directly to the camera's internal buffer. The only thing that will change is the number of shots you get until the buffer is full. A faster card will allow the buffer to empty faster.
05-11-2014, 08:30 AM   #4
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I noticed that the burst rate slowed down in AF.C with half press AF in high speed. I switched to back button AF and the burst rate seems to be unaffected. I also noticed that the buffer empties much faster with a 600x UHS I card Just my two cents.

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