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01-11-2011, 08:55 AM   #1
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Writespeed to SDHC card test!

Just did a test, that should bring it all up. Tested it with Jpg and RAW.

Basic test:
1) With (hood) cap on/off, 1/250, iso80, shooting for 15 and 60 seconds. Both wil end with a full buffer and the difference is the processing or writespeedlimit to be reached in those 45 seconds (give or take with some margin of partially filled buffer).
2) No (Hood) cap, 1/250, iso5000, RAW only to make big files. Again 15 and 60 seconds.

Jpeg:
- Well somehow the with (hood) cap on the files are very small but the camera is not making more pics as to be ecspected. This was tested before for running one star quality Jpeg's at 7 fps endlessly. There is some other limitation for this then writingspeed! Even with no (hood) cap on writingspeed is under 11 MB/s.

RAW:
- At iso 80 files are not very big with the (hood) cap on, some just under 10 Mb. The difference is 100 versus 39 RAW files giving 586 MB to write away in 45 seconds -> 13 Mb/s
- At iso 5000 files are uge, almost 30 Mb for a single file with no (hood) cap on. In 15 sec. the camera took 31 RAW that where 920 Mb and after 52 seconds the red light was out, giving a filewrite off 17,7 MB/s including all processing. In 60 seconds the K-5 took 58 RAW giving 1,736 Gb of filesspace to fill. The difference of 27 files giving 816 MB to write in 45 seconds -> 18,1 Mb/s

I think that is the limitation of the K-5 or my card or the combination. The card is a classe 10 32Gb PQ1 card, and writemax according to the manufacture is 24,5 Mb/s (for what it's word since I haven't tested it myself) with 30 Mb/s readspeed.

So untill someone else wil test this, with a SanDisc card or an SDXC card in my opinion the max writespeed for the K-5 is (just under) 18,5 Mb/s


Last edited by RonHendriks1966; 01-11-2011 at 03:34 PM.
01-11-2011, 10:25 AM   #2
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thanks for the test. What is the relation of hood to the write speed?
01-11-2011, 10:57 AM   #3
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QuoteOriginally posted by elho_cid Quote
thanks for the test. What is the relation of hood to the write speed?
Files with hood on, black pictures are a lot smaller. So you can see where the limitation is. It is not in the writing, but somehow in processing.
01-11-2011, 01:06 PM   #4
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And how is a lens hood going to produce black images?

01-11-2011, 01:26 PM   #5
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QuoteOriginally posted by amaurosis Quote
And how is a lens hood going to produce black images?
I am assuming he meant cap?
01-11-2011, 03:31 PM   #6
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QuoteOriginally posted by amaurosis Quote
And how is a lens hood going to produce black images?
QuoteOriginally posted by KansasHorizons.com Quote
I am assuming he meant cap?
Yes indeed. Sorry for my english.
01-12-2011, 05:01 AM   #7
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It's a really good idea to use cap for card speed test. It limits the randomness factor of image appearance.
01-12-2011, 06:30 AM   #8
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Mihin kamerassa voi korkkia käyttää. Vai onko se (body cap tai lens cap).

01-17-2011, 02:39 PM   #9
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thanks, I'm looking into purchasing SDHC cards for the K5 any thoughts on what would be better suited or the type of card that would handle writing 7fps.
I'm involved in motorosport.
01-18-2011, 04:11 AM   #10
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QuoteOriginally posted by RussellW Quote
thanks, I'm looking into purchasing SDHC cards for the K5 any thoughts on what would be better suited or the type of card that would handle writing 7fps.
I'm involved in motorosport.
Not cheap but the Sandisk Extreme III 30 Mb/s seem good in my K5. If you want something cheaper you could try the Integral UltimaPro SDHC Card (Class 10) which are quoted as 23 Mb/s.

Vic.
01-18-2011, 08:59 AM   #11
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QuoteOriginally posted by RonHendriks1966 Quote
RAW:
- At iso 5000 files are uge, almost 30 Mb for a single file with no cap on. In 15 sec. the camera took 31 RAW that where 920 Mb and after 52 seconds the red light was out, giving a filewrite off 17,7 MB/s including all processing. In 60 seconds the K-5 took 58 RAW giving 1,736 Gb of filesspace to fill. The difference of 27 files giving 816 MB to write in 45 seconds -> 18,1 Mb/s

I think that is the limitation of the K-5 or my card or the combination. The card is a classe 10 32Gb PQ1 card, and writemax according to the manufacture is 24,5 Mb/s (for what it's word since I haven't tested it myself) with 30 Mb/s readspeed.
QuoteOriginally posted by Arbalist Quote
Not cheap but the Sandisk Extreme III 30 Mb/s seem good in my K5. If you want something cheaper you could try the Integral UltimaPro SDHC Card (Class 10) which are quoted as 23 Mb/s.

Vic.
Maybe you coult simple do this test to see if the sandisc does his job faster then my PQ1 or that Pentax simply is the limit?
01-21-2011, 02:49 PM   #12
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I just fired off in machine gin mode until the buffer filled up at ISO80. Took 25 DNGs. Form hitting the shutter button it took 26 seconds to write to a Class 10 SDHC Card and 30 seconds to write to a Class 6

both cards were Ultima Pro.
01-21-2011, 03:22 PM   #13
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QuoteOriginally posted by Smeggypants Quote
I just fired off in machine gin mode until the buffer filled up at ISO80. Took 25 DNGs. Form hitting the shutter button it took 26 seconds to write to a Class 10 SDHC Card and 30 seconds to write to a Class 6

both cards were Ultima Pro.
And what do those cards cost? Not much profit in writetime at this setting.
01-21-2011, 03:29 PM   #14
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Quick test:
Fill up the buffer with 24 RAW DNG pics:

ADATA 16GB class 6: 52 sec to clear the buffer,
not fast enough to record full HD video

Transcend 16GB class 10: 29 sec fast enough for HD

Sandisk Extreme 3 8GB, class 6: 17 sec

Wonder how fast a Sandisk extreme class 10 is.
01-22-2011, 03:13 AM   #15
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QuoteOriginally posted by RonHendriks1966 Quote
And what do those cards cost? Not much profit in writetime at this setting.
The Integral UltimaPro SDHC (Class 10) I've just bought was £17.28 for 16Gb.

Vic.
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