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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 12 May 2013 (Sunday) 03:53
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burst rate on my 5d mark 3 seems a bit low...

 
hedonist77
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May 13, 2013 14:23 |  #16

rampanthamster wrote in post #15926787 (external link)
fixed:
i'd had it so that it wrote raw to cf and small jpeg to sd (did this on day one) BUT i didn't have the sd card in, which i assumed would make that setting redundant.

It could be taking the additional time to search for the SD card to write the jpeg to! ;)


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CyberDyneSystems
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May 13, 2013 14:31 |  #17

kcbrown wrote in post #15925494 (external link)
Drat. And here I was, hoping we'd get another fun thread like this one. :lol:

We can dream :)


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LismerPhotography
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Mar 13, 2014 14:42 as a reply to  @ CyberDyneSystems's post |  #18

I've just upgraded from a 7D, and to go from a burst of 25 Raw to 7 is a little sad! Luckily I've still got my 7D for sports/cropped uses.

I can't see much/any difference of the sustained write speed after trying different cards... The fastest I have is a x600, which seems as fast as a really old x50 card.

x600 should be able to manage 90MB/s and as it's clearly not writing at that does anyone think it's worth trying a faster card? Like a x1000?

If I put in a SD card and set it to automatically switch recording between the two then the buffer jumps to 10, but I've only got slow EYE-FI SD cards... so not sure if thats now another bottleneck!

So yes, throw in an SD card if you want to increase the buffer size... if anyone has a fast SD card can you let me know if it's faster after the buffer?




  
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rrblint
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Mar 13, 2014 22:08 as a reply to  @ LismerPhotography's post |  #19

Are you shooting RAW+JPEG? Your Maximum Burst should be 13 shots(or 18 with UDMA 7 card.


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ejenner
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Mar 13, 2014 22:57 |  #20

LismerPhotography wrote in post #16756182 (external link)
I

x600 should be able to manage 90MB/s and as it's clearly not writing at that does anyone think it's worth trying a faster card? Like a x1000?

No it shouldn't. That is read speed not write. Write on a UDMA 6 might not be more than 30Mb/s even though the card is rated to 90Mb/s read.

Agreed though that the buffer on the 5DIII is a bit pathetic. The good news however, is that with Magic Lantern's raw video there have been a LOT of tests on the fastest cards because only the very fastest will allow continuous raw video. If you dig around the ML forums you will find tests and discussion of various cards.

The most affordable 'fast' card (as of when I was looking) is the 32Gb Lexar x1000 - my first ever non-SanDisk. This allows continuous 1080 24p raw recording and clears the buffer fast enough to get 21-23 shots before slowdown rather than 11-13. The actual write speed should be close to 90Mb/s. This card has been used a lot by people using raw video and seems to have a good track record as far as reliability.

Note, that you have to be really careful with buying cards. Even x1000 cards are not all the same. For instance the Lexar 16Gb is not as fast as the 32Gb and generally the larger cards are quicker - they get expensive in a hurry though

Oh, and of course do not write anything to the SD card. You can always copy filed to the SD card during a lull in shooting if you want backup.


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burst rate on my 5d mark 3 seems a bit low...
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