Customer Reviews: SanDisk Extreme CompactFlash 16 GB Memory Card 60MB/s SDCFX-016G-X46
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I've done some write benchmarks on the 16GB version of this card and others with my Canon 40D. Here are the results:

SanDisk Extreme 60 MB/s 16GB (400X)
17 RAW, 17 seconds to clear

SanDisk Extreme III 30 MB/s 8GB (200X)
18 RAW, 17 seconds to clear

Lexar 133X Pro 1GB
20 RAW, 16 seconds to clear

Kingston Ultimate 133X 4 GB
19 RAW, 21 seconds to clear

Kingston High Speed 1024 MB
18 RAW, 37 seconds to clear

For this circa-2008 DSLR, no card over 133X improves write speeds. No benefit was expected; cameras of this vintage max out at about 12 MB/s. All but two of the current crop of Canon and Nikon DSLRs perform at near full speed with a 200X (30 MB/s) card. These cameras reach 35 MB/s at best, so a 400X (60 MB/s) card offers only slight improvements, if any. Canon's 7D and 1D IV, both capable of 60 MB/s or more, will clear the buffer as much as twice as fast with a 400X card.

The bump from 200X to 400X has no effect on general shooting speed or movie recording. Movie recording at 1080p/30 takes about 5 MB/s or as much as 8 MB/s with custom firmware. Autofocus, turn-on speed, JPEG writes, image review, and so on are almost completely unaffected. The only benefit to the higher rating with a modern camera is reduced buffer clearing time with continuous high-speed raw.

There are, however, speed variances even among cards of equal rating. Size matters. Cards 8 GB and smaller tend to perform somewhat faster in-camera than larger cards of the same family. Brand also matters. Cameras from Canon, Nikon, and Sony perform best with cards from SanDisk and Lexar. Other brands, even if capable of rated speed in a card reader, tend not to rival those two in-camera. Rob Galbraith's CF/SD database, current as of early-2009, is invaluable in determining which cards work best with which cameras.

Card-to-computer transfer rates will be limited by the card reader interface. USB 2.0, the most common, caps out at about 30 MB/s. Firewire 800 is about three times as fast and will max out this card, as will USB 3.0 and IDE/SATA converters. As well, all CF cards rated for 30 MB/s or more support UDMA, though this is of no consequence in-camera.

In short, this card is for you if you have a 7D or 1D IV and regularly hit a buffer limit in raw, or you shoot so much that card-to-computer times slow your workflow. Everyone else can spend half as much on the 30 MB/s version of same.
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on April 20, 2010
Short story: the card is superb. If you are thinking of buying it, don't hesitate.

Long story: Capacity is just shy of 30GB due to overhead. It it is v e r y fast; your camera will be the bottleneck, not this card! I tested in in 2 cameras: a newer Canon and an older Canon 20D. To my surprise, the large capacity works well with older cameras! Used with new cameras, there's nothing to know other than it is fast and works as expected. Thus, the remainder of this review will be from the standpoint of the older Canon 20D.

I had been using an 4 year old Lexar Pro 8GB 133x WA (back then, fast and high tech & costly). The performance of the 20D has actually been greatly improved using this card. To the point, I would recommend upgrading to any brand of 400x card even if you don't need the storage. There are no negative surprises but a few caveats to know for large cards in older cameras...

If you use large cards in older cameras, follow one simple rule: If the card is over 8GB, do not format it in the camera. It will be reduced to an 8GB card. If you ignore this rule, go to download dot com and search for this app: HP disk storage format tool

Because... Neither the camera nor Windoze can restore the card (not explorer, not disk admin, not XP pro, and not win7 entprise 64bit). But, the free HP utility is perfect. Newer cameras can format past 8gb. PS: I used a $12 usb card reader from Amaz to format mine: The Kingston 19-in-1 USB 2.0 Flash Memory Card Reader.
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on February 6, 2012
I was taking pictures of my nephew for fun. Just so happened, I left an 16GB SanDisk Extreme Compact Flash in my jacket pocket. My Fiance thought that the jacket was dirty. She threw it in the washer before I got a chance to take it out of the inside pocket. I was a bit nervous because I knew I had photos stored on there. I plugged it up and tried to extract the photos. To my AMAZEMENT!! It still works!!! Freaking unbelievable!! I stand by this product. Buying 2 more just for this reason!!
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on March 9, 2010
I'm using this CF card with my Canon 40D. Previously I was using 4gb Lexar 300x cards, (equivalent to about 45mb/sec) which also work just fine, but they're only 4gb each. I found myself wanting more memory and a 3rd card to go between my two camera bodies (other is a rebel xti).

There's nothing at all wrong with this CF card, it works just perfectly. Not even a hiccup. So that's good.

I was hoping to be able to take much longer continuous sequences of photos on the 40D at 6.5 frames/sec. With the Lexar 300x cards I was able to get 15 consecutive images at full resolution raw+jpg before the camera's image buffer filled up. With this card I was disappointed to find that number only rose to 17. I later looked up the stats on the 40D and found that 17 consecutive full res images was the maximum the camera can do anyway, so I know the card is faster than the camera. If I was to get a faster card it wouldn't help me at all.

So, unless you really need to take lots of fast sequences at full resolution raw+jpeg, save yourself the money and get a slower 8gb CF card, like the 15mb/sec 8gb card for $30.

I'm happy with the card though. It won't be holding me back.
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on July 16, 2010
We got this for our canon 7D, and wanted something big that would handle the video. I'd read some opinions that we didn't need to go this fast with the card, but others that thought we did.. so, we got one, just to be safe. So far so good. Seems to be high quality and reliable. A little more than would have preferred to spend on a memory card, but so far, I think it's going to be worth it, not to have to worry about corrupted data, or choppy videos, or running out of room any time soon. It takes nice long, smooth video and doesn't have to break them up. Also, just really nice to have 32 gig. Good product. Can't say for sure, but PROBABLY worth the $$ if you're needing a fast card.
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on March 11, 2010
I purchased this card for use with a Canon 5D Mark II DSLR and compared to the Extreme 3 cards that I owned prior to this, the increase in speed is noticeable. I wasn't really able to notice any difference in-camera (I don't usually shoot at high frame rates) and recording 1080p video at 30fps works fine on both cards, but I did notice an increase in transfer speeds with my UDMA enabled USB2 card reader. I can realistically transfer 1.5GB of files in about 40 seconds (transferring to a 7200RMP firewire 800 hard drive on my Mac) To transfer those same files from the Extreme III card, it takes about 53 seconds. Definitely not 2x as fast, but technically this card costs less than the Extreme III! So, for the money, I am satisfied. Highly recommended.
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on May 4, 2012
The Sandisk 16GB Extreme card is excellent.

I remember when 16Gb cards first came out, they were way expensive, and I thought "I just don't need that big of cards." Since then the price has become cheaper, I have become more of a lead finger, my cameras have more pixels, so there is no reason not to have a bigger card.

I used this card on a recent photo shoot and found that I did not fill the buffer as much as I normally do. I thought that the camera write speed was matched by normal cards, the Extreme cards can write faster, making less missed opportunities.

If you shoot in RAW format your file sizes are larger, and with cameras out now that record 70mb files, you will need to have faster cards, and a lot more storage. So get the Sandisk Extreme, they are at a good price.
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on April 14, 2013
I had this card, which worked great, at first, but after using for two months in my 5D Mark II, it wouldn't read the card and it wouldn't even allow me to format it anymore. Disappointed that it lasted for such a short amount of time and now it's too late to return/exchange it.
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on December 8, 2010
The SanDisk Extreme 32GB CompactFlash card worked flawlessly on a movie project I worked on for class. We shot all day and had plenty of space left. I used this card with a Canon 7D.
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on July 22, 2013
The 1 star is not for Sandisk, is for the seller eBADA who send me a fake Sandisk card, I have several CF Sandisk cards and a couple exactly as the same that I thought was ordering.

After a quick speed test shooting in continuous mode at 8 frames per second (Nikon D300s) there is a huge difference in writing speeds to the camera, the genuine card is way fast emptying the buffer.

Also there are a few differences in the marking of the card itself, a quick internet search will tell you what to look for.

I reported to seller and Amazon and I waiting for a resolution.

Avoid this eBADA Group seller.
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