Rumor: Possible Canon EOS 7D Mark II Specs

Started Mar 29, 2013 | Discussions thread
TTMartin Veteran Member • Posts: 7,304
Re: Rumor: Possible Canon EOS 7D Mark II Specs

elfroggio wrote:

TTMartin wrote:

The slowest UDMA CF card is 3 times faster than a Class 10 SD card and the 7D can write 13 times faster to a UDMA 6 CF card than to a Class 10 SD card.

Not really. SD cards are rated for the minimum speed (read or write) while the CF cards are rated for the maximum speed (read or write). But...

In general CF cards are usually faster than SD cards. Both Sandisk and Lexar have CF cards that are faster than any current SD card. This doesn't mean that the camera does support it.

If you look at the test speeds of CF cards and SD cards in the D800 (or any dual slot CF/SD card cameara) on Rob Galbraith's site, you'll see that the write speeds of the fastest CF cards are 150% to 200% faster than the equivalent SD card.

No two ways about it, SD cards just don't push data at the same rates as CF cards, no matter how they are rated.

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