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FORUMS General Gear Talk Data Storage, Memory Cards & Backup
Thread started 30 Oct 2017 (Monday) 10:10
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Canon 550D memory card question

 
davholla
Senior Member
Joined Nov 2014
Oct 30, 2017 10:10 |  #1

I shoot raw and after about 4 shots in a row, this takes time to record. I have a card which has a write speed of 60mbs, if I replaced it with a 90mbs would it get quicker?




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John ­ from ­ PA
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Joined May 2003
Southeast Pennsylvania
Oct 30, 2017 10:41 |  #2

It might, but a class 6 card should be sufficient for the 550D/T2i. What class card are you using?

Probably worth your time to read the thread at https://www.canonrumor​s.com/forum/index.php?​topic=15611.0 (external link).




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saea501
... spilled over a little on the panties
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Joined Jan 2010
Florida
Oct 30, 2017 10:47 |  #3

It's not your SD card, it's the buffer in the camera. It fills, cannot accept any more data and has to move that data to the card before it can accept additional input.

A larger buffer is one of the advantages more elaborate cameras have. I have never heard of increasing the buffer capacity of a camera so this is something you're going to have to live with or..........go camera shopping. Which could be...:-D......or......:-(


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John ­ from ­ PA
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Joined May 2003
Southeast Pennsylvania
Oct 30, 2017 15:55 |  #4

saea501 wrote in post #18484642 (external link)
It's not your SD card, it's the buffer in the camera. It fills, cannot accept any more data and has to move that data to the card before it can accept additional input.

Likely this is the case. You'll note below, from the 550D manual, you will fill the buffer in three images if you have RAW + "large" L selected. That's the data in the red box and the number of burst images is at the extreme right. You could confirm the buffer as the issue by turning off RAW, keeping the "large" L jpeg, and see if you get around 30+ images before things slow down. That is what I show in the blue box on the image below.

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davholla
THREAD ­ STARTER
Senior Member
Joined Nov 2014
Oct 31, 2017 08:21 |  #5

Thank you all, I thought that it was not likely to work but wanted to see anyway.




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eelnoraa
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Joined May 2007
Jan 05, 2018 17:12 as a reply to John from PA's post |  #6

The OP's intended purpose, speed class is not what matters. For still image buffer clearing, sequential speed is what matter. SC and sequential are related but not equal. I can easily make a SD card that can do 70+MB/s but fail SC10, maybe even fail SC6, but this would improve OP's usage. On the other hand, I can make a SD card to meet SC10, but can only do sequential write of 12MB/s. Although SC10, it won't help OP's usage much.

For OP's usage, first find out if your camera supports UHS-I interface. If so, those 60MB/s or 90MB/s will help clearing the buffers. But don't expect to double your frame capture before slowing down.


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Canon 550D memory card question
FORUMS General Gear Talk Data Storage, Memory Cards & Backup


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