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01-16-2011, 09:33 AM   #1
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645D - SD card recipe ?

Hi,

Looking for guidance on SD card performance since the 645D obsolesces my CFs. I'm considering either 32 or 64 sized cards (which ever perform faster) and also need to figure out SDXC, SDHC, UHS-1 or speed 10 etc. . My main requirement is high speed writes in camera (RAW), and not particularly cost conscience either (unless of course a cheaper card performs equally as well).

Thanks in advance,
--Brett

01-16-2011, 11:03 AM   #2
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I think that the fastest card will be the classe 10 card. Maybe SanDisc is the fastest. I tested my 32 GB PQ1 classe 10 card on writespeed (PQ1 states it's max writespeed is 24,5 MB/s) in my K-5 and it turned out to max at 18 MB/s. So maybe Sandisc will be faster, or maybe the total speed of Pentax isn't faster. For SDXC it's stated that UHS-I is not supported, and on the German site from Pentax is stated that the maximum size cards to be accepted is 64 GB at the time. Those cards are not as fast as the classe 10 cards, but I don't think they will be a lot slower.

So you could get a 32 GB classe 10 and a 64 GB card SDXC and have it both.
01-16-2011, 05:15 PM   #3
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How can I do a test in-camera ? (Sorry my 645D has not arrived yet) ....

QuoteOriginally posted by RonHendriks1966 Quote
.....I tested my 32 GB PQ1 classe 10 card on writespeed (PQ1 states it's max writespeed is 24,5 MB/s) in my K-5 and it turned out to max at 18 MB/s. .....
01-17-2011, 10:12 AM   #4
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QuoteOriginally posted by VoltMan Quote
How can I do a test in-camera ? (Sorry my 645D has not arrived yet) ....
I did the test with K-5 https://www.pentaxforums.com/forums/pentax-k-5-forum/128924-writespeed-secure...card-test.html Sorry for my english mistakes.

Basicly you fill up the buffer and see how files are handled after that.

For 645D: Take 15 shots (RAW) and stop right after that 15th click, time it. Then take 30 shots and stop again after that 30th shot, time it. The filesize different over time gives the approxymated writespeed with some margin of error.


Last edited by RonHendriks1966; 01-17-2011 at 03:42 PM.
01-17-2011, 01:34 PM   #5
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SDXC cards aren't as fast as the fastest SDHC yet.
Fastest SDHC that I know of are the Sandisk Pros...60MB/sec...
01-17-2011, 03:50 PM   #6
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Brilliant! Thanks for coming up with a methodology for people to use. I'll try it out soon as can. And *no problems* with your English - its perfect - it makes up for my complete and utter lack of Dutch!!

--Brett

QuoteOriginally posted by RonHendriks1966 Quote
Thanks - SanDisk Pro on the potential list..

QuoteOriginally posted by kenyee Quote
SDXC cards aren't as fast as the fastest SDHC yet.
Fastest SDHC that I know of are the Sandisk Pros...60MB/sec...
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