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05-25-2018, 01:52 PM   #1
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SD Card Speed

My K5iis seems to take a while to write RAW image files to a 32 GB Class 10 U1 PNY SD card, so I bought a 32 GB Class 10 U3 Sandisk Extreme Plus and gave it a try, really good sale at Microcenter. It did not seem much faster, still takes a long time for the preview image to show up. (Long time is relative. When you are staring at a screen 3-4 seconds is a long time.) When the write quality is reduced to 3 stars, it is nearly instantaneous. I prefer to keep full resolution; memory is cheap.

Does anyone know if the internal electronics in the K5 are limiting the write speed? Any suggestions other than reducing write quality?

I did a search on the K5 section, but did not see anything. I have the latest firmware installed, according to the Pentax site, made sure it was the K5ii version.

05-25-2018, 02:09 PM   #2
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What settings are you applying to the images in camera. Clarity seems to be the biggest offender, turn that off.

I know you are using raw files but the camera still needs to produce a jpeg to display it.
05-25-2018, 02:42 PM   #3
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QuoteOriginally posted by Spacedave Quote
My K5iis seems to take a while to write RAW image files to a 32 GB Class 10 U1 PNY SD card, so I bought a 32 GB Class 10 U3 Sandisk Extreme Plus and gave it a try, really good sale at Microcenter. It did not seem much faster, still takes a long time for the preview image to show up. (Long time is relative. When you are staring at a screen 3-4 seconds is a long time.) When the write quality is reduced to 3 stars, it is nearly instantaneous. I prefer to keep full resolution; memory is cheap.

Does anyone know if the internal electronics in the K5 are limiting the write speed? Any suggestions other than reducing write quality?

I did a search on the K5 section, but did not see anything. I have the latest firmware installed, according to the Pentax site, made sure it was the K5ii version.
You should disable processing such as distortion correction, as this adds a significant amount of time and locks up the camera.

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05-25-2018, 02:46 PM   #4
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Pentax K-5 II / IIs Review - Performance and Video | PentaxForums.com Reviews

See performance and video paragraph and the later conclusion paragraph under pros and cons.

05-25-2018, 02:54 PM   #5
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In my experience, someone may correct me if I'm wrong. The write speed of the card is not the limiting factor. The internal processing is. I shut off everthing I don't need, noise reduction, corrections, Etc.
05-26-2018, 07:14 AM   #6
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Thanks for all the replies. The primary culprit seems to be distortion correction, not resolution. RAW and 4-star JPEG seem to take pretty much the same time. 3-star JPEG is a little faster. My K50 is a bit faster, but has the aperture problem and is currently unreliable. . The K5 is a replacement, like it better for taking pictures and it feels a lot better in hand, reminds me of the way my old Olympus OM-1's felt.

My walk-around lens is a Pentax DA 18-270 which really needs distortion corrections, pretty obvious on wide angle shots. I have not been using the Pentax software, just been moving files into Picasa, an obsolete program from Google that works well for display. I will have to install the Pentax software and see if that solves my issues. If I could turn off in-camera distortion correction, then have it done simply on my laptop, that will be a good solution. Now to find that disk.
09-12-2018, 11:01 AM   #7
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QuoteOriginally posted by Spacedave Quote
  1. My K5iis seems to take a while to write RAW image files ...
  2. When the write quality is reduced to 3 stars, it is nearly instantaneous. I prefer to keep full resolution; memory is cheap.
  3. Does anyone know if the internal electronics in the K5 are limiting the write speed?
  4. Any suggestions other than reducing write quality?
  5. I did a search on the K5 section, but did not see anything.
  1. You're shooting raw - DNG or PNF ?
  2. Now your're shooting jpeg, you can't change the quality at RAW.
  3. Yes, USB 2.0 bus speed is around 35Mbyte/s
  4. There's no such thing like write quality.
    Pentax K5 II Recording to Memory Card Too Slow - PentaxForums.com
    Which SD card for K5IIs? - PentaxForums.com
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