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What's the best SD card for a Canon EOS Rebel T3i?


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In reply to an earlier post on Apr 26, 2012 2:43:11 PM PDT
"30mb/s" is extremely slow... "30MB/s" would be fast. ("mb" would be milli-bit, MB is mega-byte... Even 30Mb/s would be slow, since "1x" is 150Mb/s).

http://en.wikipedia.org/wiki/Secure_Digital#Speed_Class_Rating

For still shots, SD card class is almost not significant unless running burst mode. RAW files from my 15MP 50D run between 15 and 27MB each... Even a class 10 SD card (the 50D uses faster CF cards*) will take 2-3 seconds per image so you become limited by the internal camera buffer (the camera may take 4 frames per second, but will pause when the internal buffer fills, which may be as few as 10 shots. (Medium -- 8MP -- JPEG is running 2-4MB each... or 2-3 per second for SD card transfer).. Video is only transferring ~2MP, and compressed more heavily than JPEG, so under 0.5MB per frame.

Note that, per the link, Class 10 is for an unfragmented card... If you've shot a few images, then delete some, then start a video, you may not achieve the 10MB/s rate. Class 6 and under tend to be for cards that may be fragmented.

* My near decade old SanDisk Extreme III Compact Flash cards are 20MB/s in the 2GB size, and are the SLOW CF cards I have. My 4 and 8GB CF cards are minimum of 30MB/s -- my 50D can even use UDMA CF cards which can exceed 45MB/s. And none of my SLRs do video -- though the 50D does do ~6.3fps and JPEG only with UDMA can buffer up to 90 shots (or nearly 15 seconds of burst mode... RAW drops it down to only about 10 [R+JPEG] or 16 [R only])

Posted on Apr 26, 2012 6:11:14 PM PDT
Last edited by the author on Apr 26, 2012 6:13:49 PM PDT
Buy 4 8GB or even 8 4GB to replace 1 32GB. If something happens and a card gets corrupted you won't lose the shots of your whole vacation.

Edit: That also works for your camera being stolen.

In reply to an earlier post on Apr 26, 2012 8:22:06 PM PDT
Last edited by the author on Apr 26, 2012 8:22:53 PM PDT
I concur on the multiple smaller cards...

I tend to use 512MB/1GB on my ancient 4MP Canon G-2; 2GB/4GB on the 8MP EOS 20D; 4GB/8GB on the 15MP 50D (note the scaling -- for each doubling of MP count, the card range doubles; the larger cards in each set are used for known long events where changing a card would be a problem, the smaller ones are the regular cards... Basically for each camera the card range handles about the same number of images as the sizes for the other cameras.)

And I DID have a card go bad... a 512MB on the G-2. I lost about 80 of 120 images, had to scour the city (I was overseas at the time) to find the ONE (!) 512MB CF card in Harrogate UK for sale. Then had to go back to Fountains Abbey to recreate most of the subject matter that was lost.

Uhm... as for stolen camera... smaller cards only help if the cards are not carried in the same container as the camera <G>
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This discussion

Discussion in:  Photography forum
Participants:  20
Total posts:  28
Initial post:  Oct 25, 2011
Latest post:  Apr 26, 2012

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