1. Canon 5d Mark Iii Video
2. Canon 5d Mark Iii Sd Card Slot

The SD card slot of EOS 5D Mark III doesn't support high speed SD cards(UHS-1). It is said that the maximum speed is 133x which is awfully slow in burst mode. In fact, Canon was going to name the 6D Mark II, '6D Tanaka' in honor of the things that camera is lacking. They lost out but, could have named the M50. The 'M Tanaka'.

Verified CF (CompactFlash) memory cards

1. Is there any truth to the claims in this link that the SD Card speeds are limited by the 5D Mark III to 133x? Canon 5D Mark III and SD Cards.
2. P.1 #7 p.1 #7 Canon 5D Mark iii SD slot repair: harbour photog wrote: Thanks will do. I need it as I like recording to 2 cards for weddings. Yes me too on pro jobs, but I always use the SD to and from the PC as there's less chance of bending CF pins. I don't like CF cards much.

• This information does not guarantee all memory card operations.
• When shooting movies, use a large-capacity card with a fast writing/reading speed.

• If you use a slow card when shooting movies, the movie might not be recorded properly. Also, if you playback movies on a card having a slow read/write speed, movie might not playback properly.
• If you want to shoot still photos while shooting a movie, you will need an even faster card.
• The above table lists verified CF cards by their product names in Japan.
• For details about the preceding CF memory cards, or other cards, contact the card manufacturers.

• UDMA (Ultra DMA) and UDMA7 CF cards can also be used with the camera.
• UDMA/ UDMA7 compatible CF cards enable faster data writing.
• The camera cannot use Type II CF cards or hard disk cards.

Verified SD/SDHC/SDXC memory cards

• This information does not guarantee all memory card operations.
• When shooting movies, use a large-capacity SD card with a fast writing/reading speed.

• If you use a slow card when shooting movies, the movie might not be recorded properly. Also, if you playback movies on a card having a slow read/write speed, movie might not playback properly.
• If you want to shoot still photos while shooting a movie, you will need an even faster card.
• The above table only lists verified SD/SDHC/SDXC cards available for sale in Japan.
• For details about the preceding SD/SDHC/SDXC memory cards, or other cards, contact the card manufacturers.

Canon 5d Mark Iii Video

I do agree Canon cripple things intentionally is a bad habit. But I can understand why 5D4 doesn't have XQD or UHS-II.
First XQD, Canon was never behind the development of XQD. Canon is one of the driver for CFast format. Now, technically, XQD and CFast is really exactly the same with different packaging. Both are SATA protocol interface. So the conclusion is really about format war. In this case, a losing format war from the past. As far as I know, there is a new format coming out, supposed to be the agreement between the XQD and CFast crowd. Let's wait for it.
2nd reason is cost. Given what 5D4 needs, there is nothing XQD/CFast USH-II can do but CF or USH-I can't do. What is the reason to go for a much more expansive format? As an consumer, I actually prefer an existing interface as long as it does everything the body is capable of. Now I think having UHS-II interface still make sense because it is backward compatible with USH-I. XQD/CFast, I just don't see why I want to ditch all my CF for these 'will be short live' and expansive format.

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Canon 5d Mark Iii Sd Card Slot