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04-12-2016, 07:06 PM   #1
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K3 & K3-ii memory card write speed

Have a Pentax K3 & K3-ii cameras and need to know what is the fastest speed the camera's processor can write to a Class 10 SDHC &/or SDXC? Don't want to spend money on an expensive card if the camera's processor can't match it. The write speeds on class 10 cards vary significantly as well as the price. Thank you. Greg

04-12-2016, 07:51 PM   #2
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There's another thread somewhere...I did some testing that seems to suggest around 36MB/s is the upper limit on the K-3II.
04-12-2016, 08:45 PM   #3
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Sandisk Extreme Pro have been good cards for me. I have a mix of 45mb/s and 95mb/s cards. I've seen testing indicating the K-3 maxes out around 36mb/s. Pentax K-3 II SD Card Write Speed Comparison of Fastest Memory Cards for the Pentax K3 II Digital Camera - Camera Memory Speed Comparison & Performance tests for SD and CF cards Other tests indicate a somewhat higher speed closer to 45mb/s. So I would not get anything less than 45mb/s cards if you were trying to low ball the cost and 95mb/s otherwise.

Personally I am confused when folks spend $1,000 on a camera and lens and worry about saving $20 on a cheap SD card. Card speed is not the only factor, so is reliability and durability. Lots of places to save money, the camera's memory card is not one, IMHO.

Welcome to the forum by the way @Glospreys. And if you monitor the price watch sub-forum there are often good deals on memory cards. I've gotten almost all of my cards on sale and paid far less than the regular price by watching for the sales. Pentax Price Watch - PentaxForums.com
04-12-2016, 08:53 PM   #4
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I'd recommend a Sandisk extreme or extreme pro cards not only for their speed, but also for their reliability.

Our tests suggest that the K-3 can leverage the faster UHS-I speeds offered by the 95Mb/s extreme pro cards:
Pentax K-3 Review - Performance and Burst Mode | PentaxForums.com Reviews


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04-12-2016, 09:34 PM   #5
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The test provided by jatrax ( Pentax K-3 II SD Card Write Speed Comparison of Fastest Memory Cards for the Pentax K3 II Digital Camera - Camera Memory Speed Comparison & Performance tests for SD and CF cards ) fits to my personal results and the results provided by other forums, nowhere was a speed measured above 40 MB/sec.
(
Transcend SDXC UHS-I U3 128GB Speicherkarte (95 MB/s Lesen, 60MB/s Schreiben) ,
Transcend Ultimate-Speed SDXC Class 10 UHS-1 64GB Speicherkarte (bis 90MB/s Lesen, 600x)
Transcend Ultimate-Speed SDXC Class 10 UHS-1 32GB Speicherkarte (bis 90MB/s Lesen, 600x)
SanDisk Extreme Pro SDHC 16GB Class 10 Speicherkarte (bis zu 95MB/s lesen)
)
04-12-2016, 10:30 PM   #6
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I did some basic tests with my K-3 and a Sandisk extreme pro card. In fact I always shoot with Hi-continuous shooting, and the burst speed is critical for me.

Importantly, any tests must be conducted with NO (zero) in-camera processing. I have been able to achieve easily 8.3 fps 24 Mp JPEG [***] for 10 s, without any drop in speed. That is a transfer rate in excess of 50 Mb/sec.

My 5 cents....
04-12-2016, 10:43 PM   #7
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QuoteOriginally posted by hcc Quote
I did some basic tests with my K-3 and a Sandisk extreme pro card. In fact I always shoot with Hi-continuous shooting, and the burst speed is critical for me.

Importantly, any tests must be conducted with NO (zero) in-camera processing. I have been able to achieve easily 8.3 fps 24 Mp JPEG [***] for 10 s, without any drop in speed. That is a transfer rate in excess of 50 Mb/sec.

My 5 cents....

How long was the time after the last photo until the writing LED went off?
04-12-2016, 10:46 PM   #8
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I personally will not buy anything less than a 45 MB/sec. card for my K3. But there's another factor you need to consider. The read speed. If Your computer has USB 3 available, Use a USB 3 card reader. And by as fast a card as you can Reasonably afford. Remember, SD cards are much cheaper than film/processing. The cost of only 1 roll of film plus developing will pay for 1 32 GB memory card. And it can hold maybe 1000 photos versus 36 photos using film. You are actually saving money by using memory cards, so why worry about it. it would actually be cheaper to buy a new memory card every time you fill one up instead of paying for film and processing for the same number of images. When I was using a film camera, At least 50% of my budget went for film and processing. Nowadays At least 90% of my budget goes into my equipment. don't skimp on memory cards. It's simply not worth it in the long run.

04-12-2016, 11:38 PM   #9
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QuoteOriginally posted by joergens.mi Quote
How long was the time after the last photo until the writing LED went off?
Off memory, a couple of seconds maximum. I regularly shoot Hi continuous 8.3 fps. After a burst of 10 shots, I typically wait less than 1 s.
04-13-2016, 02:27 AM   #10
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QuoteOriginally posted by hcc Quote
Off memory, a couple of seconds maximum. I regularly shoot Hi continuous 8.3 fps. After a burst of 10 shots, I typically wait less than 1 s.
I'm not sure that makes sense...10x24MB=240MB - to write that in 1s would suggest a write speed of 240MB/s.
04-13-2016, 03:48 AM   #11
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QuoteOriginally posted by hcc Quote
Off memory, a couple of seconds maximum. I regularly shoot Hi continuous 8.3 fps. After a burst of 10 shots, I typically wait less than 1 s.
The Question was: "I have been able to achieve easily 8.3 fps 24 Mp JPEG [***] for 10 s" how long will ist last by this type of shot with 83 pictures.

04-13-2016, 07:31 AM   #12
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QuoteOriginally posted by victormeldrew Quote
I'm not sure that makes sense...10x24MB=240MB - to write that in 1s would suggest a write speed of 240MB/s.
Writing start during the burst. It last about 1 s more than the burst typically.

---------- Post added 04-14-2016 at 12:33 AM ----------

QuoteOriginally posted by joergens.mi Quote
The Question was: "I have been able to achieve easily 8.3 fps 24 Mp JPEG [***] for 10 s" how long will ist last by this type of shot with 83 pictures.
I am not sure to follow the question.
The write up starts during the burst and might last 1-2 s more, under the conditions that I described: JPEG 24 Mp [***], K-3, zero in-camera processing, Sandisc Extreme Pro.
04-13-2016, 07:40 AM   #13
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Well yours is much faster than my K-3II then... In my testing it took 18s to write a full buffer of 652Mb, similar to other results in this thread here:
www.pentaxforums.com/forums/6-pentax-dslr-discussion/318268-fastest-sd-card-k-series.html
05-07-2016, 07:31 AM   #14
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Any class10 card is more than enough for pictures and probably for hd video...
05-30-2016, 06:04 AM   #15
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I wonder if the new Pentax K1 is driving up the cost off 64gb SDXC cards. I recently purchased a used K3 and have finally decided to start shooting Raw images so was looking to purchase a 64gb SDXC card for slot #1. None off the brands I use are reasonable, guess I will just wait until another sale comes along
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