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Thread started 03 Apr 2012 (Tuesday) 10:56
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SanDisk UHS-1 RAW/Buffer Questions...

 
recrisp
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Apr 03, 2012 10:56 |  #1

I have a (Canon) T2i/550D camera, I am not happy with the RAW buffer rate, it actually seems slower than my XSi/450D that I replaced.
(I'm not concerned with video at this point)
The file sizes are different, I realize, and I know that makes a big difference, which is probably the reason, but I was wanting to get the best speed I could, IF I could, which brings me to the question...
(I have a definitely lag on my T2i that wasn't apparent on my XSi, both are rated as SLOW [3.5fps] as far as the FPS goes, I know)

I now use Sandisk Extreme III Class (10) [30 mb/s]for shooting in my T2i, I thought, "Why not upgrade the card to see if that would better match the buffer?".
The card I was looking at is the "SanDisk Extreme Pro SDHC/SDXC UHS-I Memory Cards_16 GB Black". [95mb/s]
Now the question is, is this even possible?
I have read MANY conflicting reports, so I gathered from what I had read that it wouldn't help me in my case, that is, until I read the SanDisk information on their site. (See link below)

[I realize that uploading RAW images to my computer using a USB 2.0 will not get what is claimed, so for that, I can get a USB 3.0 card reader, but that is not what I need to know about, only the RAW buffer thing.] :)

Here's where SanDisk has a place to see what cards are compatible with what camera.
http://pct1.sandisk.co​m …d=1002&dtid=7&h​dnSiteID=1 (external link)

So my real question is really, is SanDisk avoiding telling the entire truth here?
(Don't get me wrong, I love them, and I think they are a stand-up company)
Are they telling me that I can in fact put this card in my T2i and actually benefit from it, RAW/Buffer-wise?
It definitely gives that impression by reading their information, whether or not it's real, I don't know, hence my question. :)

If you don't want to click on the link, here's what it says on the site...
(I have highlighted in RED BOLD where the questions arise from their online statements)

Thank you for reading so far, I know it's long, and I did do a search beforehand, but didn't see this anywhere...

Randy

"
SDHC/SDXC UHS-I Memory Cards_16 GB Black SDSDXPA-016G-A75

IMAGE: http://pct1.sandisk.com/Assets/PCT/PCT/LargeImages/ext_pro_sdhc_95mbs_16GB_143.jpg



Built to keep up with your most demanding shoots, get the capacity you need for more non-stop burst shooting and capturing Full HD† video. You’ll never miss a shot or a moment.
The SanDisk Extreme Pro SDHC UHS-I memory card features technologies that were previously only available in our professional line of CompactFlash® memory cards. Managed by the Power Core™ Controller, the SanDisk Extreme Pro SDHC UHS-I memory card raises the bar for speed and performance within the SanDisk SD™ memory card product line. The advanced Error Correction Code engine improves overall data integrity and reliability of the card during read and write. Experience RAW + JPEG continuous burst mode shooting and capture fast-action Full HD† video like never before. For capturing Full HD video or that professional shot-trust SanDisk Extreme Pro SDHC UHS-I memory cards for your DSLR or HD camcorder
  • Extreme speed means you'll get the shot you want with more continuous burst mode shooting and rapid transfers to your computer.
  • Extreme Full HD video recording speed enabled by UHS Speed Class 1†† and Class 10 lets you capture fast-action video in Full HD, even in 3-D†.
  • Engineered with the Power Core™ Controller, the SanDisk Extreme® Pro™ SDHC™ [SDXC™ for 64GB] UHS-I memory card delivers blazing fast performance distributing image data across the card more rapidly and efficiently.
  • Extreme reliability and endurance, the Power Core™ Controller's firmware increases endurance through wear leveling. The Power Core Controller's advanced Error Correction Code (ECC) engine improves overall data integrity and reliability of the card during read and write.
  • Extreme durability- built for and tested in harsh conditions-these cards are temperature proof, water proof, shock proof, and x-ray proof***. [only 8-32 GB packs]
  • Extreme trust: From the flash memory card brand trusted by professional photographers.
Not all devices support SDHC™ or SDXC™ memory cards. Contact your device manufacturer for details.

*Up to 95 MB/sec (633X) read speed. Write speed up to 90 MB/s (600X). Based on SanDisk internal testing; performance may be lower depending upon host device. 1 megabyte (MB) = 1 million bytes. X = 150KB/sec.
**1 gigabyte (GB) = 1 billion bytes. Some capacity not available for data storage.
***SD, SDHC, microSD and microSDHC card formats up to 32 GB only; See www.sandisk.com/proof (external link) for additional information.
†Full HD video (1920x1080x30fps) HD and 3D video support may vary based upon host device, file size, resolution, compression, bit rate, content, and other factors. See:www.sandisk.com/HD (external link)
††UHS Speed Class 1 designates a performance option designed to support real-time video recording with UHS-I enabled host devices."

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Mocows
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Apr 03, 2012 14:03 |  #2

From what I gather the T2i doesn't support the speed increase of UHS-i so they'll drop back to class 10 anyways (hard to find a yes/no at all about UHS support in general). You can still use the card and it is a better card then the class 10 so it could in theory still be better. Technically the 95MB/s reading is the ceiling of their read/write speed so it can hit 95 but the continuous read/write average should be lower.

Now back to burst rate

Maximum Burst
JPEG (Large/Fine): Approx. 34, RAW: Approx. 6
Based on Canon's testing standards with a 2GB SD memory card, ISO 100 and Standard Picture Style
Varies depending on the subject, SD memory card brand, image-recording quality, etc.

So 6 is still the limit discounting the buffer dumping to the card which is why getting a faster card is better. It's just the cards are faster now then what the T2i can handle sadly.

The only real benefit you may see is emptying the card via a card reader that supports UHS.


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Mocows
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Apr 03, 2012 14:16 |  #3

And actually you aren't far off in saying the XSi may have been a bit "faster" while shooing burst RAW files. (Take this just as an observation rather then hard data)

Buffer clearing time - RAW
XSi (external link) 6 seconds (after 5 RAW frames)= 1.2 seconds/raw
T2i (external link) 9 seconds (after 6 RAW files*) = 1.5 seconds/raw

You are looking at 12MP in the XSi vs 18MP in the T2i (if you're shooting full res) that's a huge difference per file.


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recrisp
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Apr 03, 2012 19:21 as a reply to  @ Mocows's post |  #4

Mocows,

That's what I thought too, but I guess you did see that their site made it sound as though it'd help speed it up with my T2i. What they really probably mean is that it would work on my camera, but not speed anything up, with the exception of the upload.
That's really kind of deceptive the way I see it, I'm not upset, but I am sure that someone at SanDisk's ad agency carefully worded it to where dummies (me) would buy them and not know for sure. :)
I have read case after case where people bought these and were amazed at how FAST their cameras were after they used them, I guess it's mind over matter. People mentioning how their buffer rate went up, and so on, but then again, others that 'seemed to know', said otherwise.

Like I said, I guess it's just a case of advertising that works, not really a blatant lie, but also at the same time, not the truth...

I really didn't look up the speeds on the two cameras, (as you did, thank you!) but I knew it was as you say, I'm kind of wondering if I didn't have one of my slow cards in there by accident, I mean, it was SLOW!
The end was what the slow part was, it took several seconds before I could shoot again. I always shoot RAW (only) and it is definitely 6 SLOW and agonizing shots, but, the image is a LOT better than my XSi. I guess I am happy enough, I missed several shots though while waiting, which has never happened to me before with my XSi.

Thank you for you help I really do appreciate your time on this. I wish there was some magic card out there that would do it, but I guess I'll have to upgrade camera to get where I need, which I am going to soon anyway.:)

Randy


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Apr 04, 2012 11:00 |  #5

Well they are trying to get sales right? :P I can't remember when UHS came out but at least the card is backwards compatible so if you were to upgrade later on (and purchased this card), it'd be usable and might take advantage of the speed :)

Question: Does the T2i allow you to select the size of RAW file you shoot? On my 7D I shoot mRaw [10mp] so if you have that ability, you may be able to get a few more shots out before your buffer fills up.

You'll notice a buffer enlargement as you go up in series (ie 60D [16 raw], 7D [15 raw, but i shoot at med raw so its a bit more], etc..) so something to look forward to :)


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recrisp
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Apr 04, 2012 13:43 |  #6

Mocows wrote in post #14208526 (external link)
Well they are trying to get sales right? :P I can't remember when UHS came out but at least the card is backwards compatible so if you were to upgrade later on (and purchased this card), it'd be usable and might take advantage of the speed :)

Question: Does the T2i allow you to select the size of RAW file you shoot? On my 7D I shoot mRaw [10mp] so if you have that ability, you may be able to get a few more shots out before your buffer fills up.

You'll notice a buffer enlargement as you go up in series (ie 60D [16 raw], 7D [15 raw, but i shoot at med raw so its a bit more], etc..) so something to look forward to :)

Yeah, they definitely are trying to make some money... heheh

I'll wait on the technology to catch up, I guess, it sounds as though the cards are way ahead of the cameras. I do plan on getting a 1DMKIV next month, so I'll be looking at this same problem again later. heheh
(I won't have that problem with 10fps second though, I already know)
The T2i will be my second camera, like a back-up, so it won't be used for BiF anymore soon, it'll be suited for a wider lens, I think, which won't be clicking away very fast.:)

The T2i only has RAW, and RAW+jpeg, I don't use the latter. It's fine, I can wait until I get the new camera, I only got this to tide me over 'til I could upgrade, but it bothered me that the card company said what they did, and it's misleading. I really, really like this camera though, it's a lot like a 7D in a lot of ways, it has 'some' of the same things in it, and I like that, I was going to get a 7D, but I held out for the other one.

Thanks for the insight Mocows!:)

Randy


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SanDisk UHS-1 RAW/Buffer Questions...
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