Using these on my Canon C200. I have been shooting mostly 12bit raw footage with these card and they are performing perfectly. The nice thing about the 512gb size is that is cheaper compared with the smaller sandisk cards per gb. I can put well over an hour of footage on the first card before switching to the second one.I have always found SanDisk cards to be the most reliable in the past. These CFast seem to be equally as dependable. They are expensive, but they are less of a gamble.

Like most SanDisk products, their POST2017 CFast memory cards are EXCELLENT performers, robust and reliable. Ive been using SanDisk CF and SD cards in Canon 1D and 5D DSLRs and Leica M and Q series cameras for more than 10 years now, and Ive never had any problems with the cards themselves Ive had a few minor issues with cheap, generic card READERS cracked wires inside their folding or wrapped plastic insulation causing random data download interruptionsdisconnects.THIS IS THE IMPORTANT PART REGARDING SANDISK CFAST CARS its true that SanDisk released their original CFast cards prematurely, and that they had very irritating bugs, causing significant risk of data corruption and loss as some reviews validate. While this was highly frustrating and worrisome and lead ... MoreLike most SanDisk products, their POST2017 CFast memory cards are EXCELLENT performers, robust and reliable. Ive been using SanDisk CF and SD cards in Canon 1D and 5D DSLRs and Leica M and Q series cameras for more than 10 years now, and Ive never had any problems with the cards themselves Ive had a few minor issues with cheap, generic card READERS cracked wires inside their folding or wrapped plastic insulation causing random data download interruptionsdisconnects.THIS IS THE IMPORTANT PART REGARDING SANDISK CFAST CARS its true that SanDisk released their original CFast cards prematurely, and that they had very irritating bugs, causing significant risk of data corruption and loss as some reviews validate. While this was highly frustrating and worrisome and lead directly to SanDisk developing the goofy and cumbersome sanitization procedure a crude and tedious workaround, THESE PROBLEMS WERE FULLY RESOLVED BY LATE 2017, AND HENCE, ANY SANDISK CFAST CARDS MANUFACTURED IN 2018 AND NEWER ARE FLAWLESS IN CAMERAS FOR WHICH THEY ARE COMPATIBLE. AND HERES THE REALLY GREAT NEWS IF YOURE WILLING TO FORGIVE SANDISK FOR THEIR INITIAL BLUNDER AND EXTEND JUST A LITTLE BIT MORE TIME AND EFFORT, YOU CAN FIND COMPLETE SATISFACTION AND BLISS, AS SANDISK WILL REPLACE COMPLETELY FREEOFCHARGE YOUR PRE2018 CFAST CARDS WITH THE NEWEST MODELS, WHICH WORK FLAWLESSLY AND AS ADVERTISED. HERES WHAT I DID, AND IT WORKED1. Contact SanDisk BY PHONE tollfree, and explain that your old Sandisk Cfast Cards DO NOT WORK, EVEN USING THE SANDISKRECOMMENDED SANITIZATION PROCEDURE2. Youll be asked to email SanDisk CLEAR IMAGES of your defective CFast cards I used my cell phone to do this. Be sure to capture a clean image of the SERIAL NUMBER on the thin edge of your defective CFast card. You may need to pay careful attention to your lighting conditions to ensure that the tiny inscribed SERIAL NUMBER on the edge of the card is legible. If your CFast card doesnt have a clearly marked serial number on the thin edge of the card, dont worry about it. Just take photos of the front AND BACK of the card anyway. This procedure sending photos of your defective cards is merely an attempt by SanDisk to prevent folks from sending in counterfeit cards for replacement with real ones3. The SanDisk representative on the phone will give you explicit instructions for how and where to EMAIL these images ALONG WITH A PHYSICAL ADDRESS TO SEND YOUR ACTUAL DEFECTIVE CFAST CARDS. Follow these simple instructions faithfully dont worry about the OEM plastic clamshell cases for the cards they dont want those back4. In 24 weeks, youll receive BRAND NEW SanDisk CFast cards in the identical quantity and GB capacity of that or those which you returned for replacement. I returned TWO 2 early2017 SanDisk 64GB CFast cards, and I received TWO 2 BRAND NEW mid2018 SanDisk CFast cards in the mail 18 days later5. It doesnt matter where from whom you purchased your OEM SanDisk CFast cards, BUT YOU WILL BE ASKED TO PROVIDE AN IMAGE OF YOUR SALES RECEIPT, proving that you or someone else actually and legitimately purchased the card in the first place. BH has ARCHIVES of past purchases that go back wellbefore CFast cards were invented, as do many other reputable vendors. My 2yearold archived shipping inventory from BH was accepted by SanDisk as a credible receipt of purchase. If you cannot locate sufficient proof of purchase or receipt did you try your credit card issuer, explain your situation to the SanDisk representative on the phone, and ask to return the cards for replacement anyway. If youre a skilled negotiator and you get an empathetic rep on the phone, you may get lucky.Postscript yes, it was disappointing indeed, highly frustrating that SanDisk originally released these CFast cards before they were actually ready for prime time and yes, it was frustrating having to go through the trouble of reaching out to SanDisk to coordinate the returnreplacement process, and then WAIT for 23 weeks for my new replacement cards to arrive. HOWEVER...all that being said, the bottom line for me really is this I now have two 2 SanDisk CFast cards that work EXACTLY as advertised and EXACTLY as I expect them to work EXTREMELY FAST read times EXTREMELY FAST write times and CONFIDENCE that these cards will continue to deliver safe, secure, reliable performance under heavy professional use, as indeed they have for about a year now.I use these CFast cards in Canon 1DX and 1DX MarkII cameras, and theyve worked FLAWLESSLY every time. I use both a SanDiskbranded and a Transcendbranded portable USBpowered CFast Card Reader both purchased here at BH I use these with a 2016 Apple MacBook Pro computer running OS High Sierra 10.13.6. Ive had no issues using both Apple and other USBCtoUSBA converters the Sanho HyperDrive DUO USBC Hub has been particularly excellent and highly versatile also available here at BH.Along with many PREVIOUSLY valid complaints, there are a few grossly unfair reviews on this page from folks who didnt understand exactly what they were purchasing i.e. folks who INCORRECTLY ASSUMED that CFast cards, which appear to be physically identical to Compact Flash cards, would work in their Compact Flashcompatible cameras like Canon 5series and older Canon 1series DSLRs. REST ASSURED, CANON AND NIKON USERS THE 2018ANDNEWER SANDISK CFAST CARDS WILL WORK EXACTLY AS ADVERTISED. While its very possible that you might unwittingly purchase a pre2018 SanDisk CFast card from a retailer that doesnt move much of this product a pre2018 CFast card has been sitting on his shelf for more than 18months, this is not a problem when purchasing from BH, as ALL of the SanDisk CFast cards theyre now selling are the latestgeneration 2018andnewer cards, WHICH MEANS THEYRE THE UPDATED, PROPERLY FUNCTIONING CARDS from SanDisk. THESE CARDS DO NOT REQUIRE THE GOOFY, RIDICULOUS, AND TEDIOUS SANDISK SANITIZATION PROCEDURE THAT THE PRE2018 CARDS DID. These newer CFast cards 2018 and newer are completely maintenancefree and perform flawlessly and reliably, just as most of us have experienced and come to expect from other SanDisk card types e.g. CF and SD.IF, LIKE ME, YOU PURCHASED A SANDISK CFAST CARD THAT WAS MANUFACTURED PRIOR TO LATE 2017 AND YOUR CARD HAS BEEN GIVING YOU HEADACHES OR YOURE JUST NOT CONFIDENT IN ITS RELIABILITY, SIMPLY FOLLOW THE 4STEPS I OUTLINED ABOVE, AND YOULL SOON BE HAPPILY USING A BRANDNEW, LATESTGENERATION, PERFECTLY FUNCTIONING REPLACEMENT SANDISK CFAST CARD, JUST AS I AMI do not work for BH nor for SanDisk. Im just another passionate photographer trying to get the best from my gear, like most of you who are reading this...

I recently purchased a Canon Mark II DX1 with 4K imaging. We needed a fast, high quality card in order to capture the details we wanted for this camera. After doing some research, I wanted to purchase a CFast card instead of a Cflash card. Our first SanDisk Extreme Pro 128GB 515MBs card is great Gives us a great picture and is light speed. We went ahead and ordered a backup card. For 300 we expect this product to work every time. That wasnt the case. The second SanDisk Extreme Pro card has already crashed while transferring footage 3 times already. It will say you have a corrupted file then it ejects the card improperly causing it to erase all of your data. When you have to worry about your footage and if its going to make it to your computer safely, there is a ... MoreI recently purchased a Canon Mark II DX1 with 4K imaging. We needed a fast, high quality card in order to capture the details we wanted for this camera. After doing some research, I wanted to purchase a CFast card instead of a Cflash card. Our first SanDisk Extreme Pro 128GB 515MBs card is great Gives us a great picture and is light speed. We went ahead and ordered a backup card. For 300 we expect this product to work every time. That wasnt the case. The second SanDisk Extreme Pro card has already crashed while transferring footage 3 times already. It will say you have a corrupted file then it ejects the card improperly causing it to erase all of your data. When you have to worry about your footage and if its going to make it to your computer safely, there is a problem there. I have been going back and forth with the manufacture trying to get another card sent out. It is much more trouble then you will want to deal with. DO NOT BUY THIS CARD IF YOU DO, BEWARE YOU MAY GET A BAD ONE AND WILL HAVE TO DEAL WITH THIS AS WELL. I SEE MANY OTHERS ARE HAVING THE SAME PROBLEM. BUY FROM ANOTHER BRAND OR WAIT TILL THE TECHNOLOGY IS CORRECTED.