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With 12 mb/s write your going to get barely any frames. You need the max you can get with a SanDisk ultra at 30mb/s read and write.

That's what's so weird, I have a Sandisk Ultra 16GB class 10 which advertises 30MB/s read/write speed. But the benchmark says different.

The T2i SD hardware is limited to around 21MB/s iirc.

It makes sense to have a faster SD card (45MB/s or 95MB/s) to ensure that the slowest device in the recording chain is the SD slot in the camera.  Rather then a slower card which will limit recording speed even further.

All SD cards should be backwards compatible.  So faster cards with newer technology still work in older cameras.

That makes sense. So these UHS technology cards still boost the speed? That's what I meant by "compatible"

Hey  guys/gals,

I've been trying to figure out this sd read/write speed thing and it's relation to raw recording.

I've been testing RAW on my Patriot 16GB class 6 sd. It seems to be working great and the bechmark tests have it clocked for about 12MB/s write and 20MB/s read.

I researched sd card speeds and from what I've read, the "extremepro" cards or anything claiming 45MB/s read/write and up, uses UHS technology witch the T2i isn't capable of. I'm wondering if that's correct?

I also recently purchased a Sandisk 16GB class 10 card with expectations of higher write speeds. According to my benchmarks, this card actually writes slower than my class 6 at around 8-9MB/s. I exchanged that one thinking it could be a bad card but sure enough my new card has the same slow speeds.

So what the hell.

I thought the fancier cards claiming 45 and 95MB/s weren't compatible with the T2i but other posters have been showing they're getting much more frames with theses cards...

By the way, if anyone is looking to buy SD cards...From what I've gathered, these Sandisk Extremepro cards are using something called UHS to enhance the read/write speed. The 550D isn't compatible with UHS, so it defaults to the maximum read/write speed of a regular class 10 card.

Something to think about if you're off to buy a really expensive card.

EDIT: I'm testing with a class 10 card, seems that the speeds are no where nearing what NedB got...
EDIT 2: Well now I'm running a benchmark test, and the card seems to actually be SLOWER than my class 6 one. 

Hi all,

I can't seem to find anything related to how the resolution is being achieved. I read "crop" but my question is, what I see in the LCD is being recorded and resized to the 960x540 for example? Or is the 960x540 a small subset of what is visible? I assume the entire image in the LCD is resized so that you are getting what you see?

Is the new ML code basically taking the full sensor RAW image, and "cropping" (resizing?) it?

I assume the reason we're limited on resolution is the 21MBp/s limit of the SD card? Or is the processor not fast enough to handle a 1920x1080 pull?

Sorry, trying to get my head around how this works.. my camera is out of commission right now, so can't test anything out.

When recording with RAW, there's a little window that shows you the frame in the liveview. It's cropping the visible LCD to a tiny portion in the middle. It's as if you're shooting with a smaller sensor camera.

From what I've heard. The T2i can't write at certain card speeds because of the buffer. Which means we're limited to around 25MB/sec right?

Sorry if it's noobish, I haven't read every single post yet.