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The fact that your Canon EOS 7D Mark II has two memory card slots gives you a tremendous amount of flexibility. You can use the second card as overflow when you fill up the first card with images, or you can store different image formats on each card. The latter is a wonderful option for professional and semi-professional photographers.
EOS Mark III has a UDMA 7 capable CF slot and writes to those kinds of cards very quickly. If you put a UHS-1 type SD card in the camera then it's not so fast at writing since the camera doesn't provide the faster UHS-1 support. View full Canon EOS 5D Mark II specs on CNET. AE lock, AF lock, FE lock, LCD live view mode, RGB primary color filter, audio recording, auto power save, camera orientation detection, depth-of.
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'.
For example, if you’re shooting a sporting event where you want to post images online immediately, you can store images in the JPEG format on one card and in the RAW format on the other card. When someone orders an image from your online gallery, you can edit the RAW image to pixel perfection in your favorite image-editing application. To specify how your camera writes images to two cards, follow these steps:
Insert two cards in the camera.
Press the Menu button.
The menu displays.
Use the Quick Control button to navigate to the Set Up tab and then use the multi-controller button to navigate to the Set Up1 menu.
Rotate the Quick Control dial to highlight Record Func+Card/Folder Sel and then press Set.
The Record Func+Card/Folder Sel menu displays.
Press Set again and choose one of the following options:
Standard: Images will be recorded to the card you specify with the Record/Play menu command. Images will only be recorded to the card you specify. When the card becomes full, you must invoke the Record/Play menu command again to select the other card for recording images and playing them back.
Auto switch card: Similar to the Standard method, but the camera automatically switches to the other card when the card you specify for recording and playback with the Record/Play command becomes full.
Rec. separately: When you choose this option, you can specify the image format that is recorded to each card. For example, you can record images in the RAW format to one card for editing and record images in one of the JPEG formats for displaying on the web. When you specify this option the number of images you can record (burst) when choosing the Low Speed Continuous or High Speed Continuous drive option decreases.
Rec. to multiple: When you choose this option, each image is recorded simultaneously to the CF and SD cards at the same size and format. You can specify JPEG and RAW. This option is handy when you’re shooting lots of images that will be used by two parties, or will be edited by two parties. When the cards are full, simply hand the duplicate card to the other party that will be using or editing the images.
When you shoot with cards of different capacities, the number of shoots remaining, which is displayed on the LCD panel, will be for the smaller capacity card. When you fill the smaller card, it will not be possible to record additional images. Therefore, it makes sense to use cards with the same capacity.
Press Set.
You’re ready to shoot up a storm with two cards.
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When you record with multiple cards, you need to specify which card records and plays back images first. To specify which card records and plays back, follow these steps:
Specify the method by which the camera writes images to two cards.
If you’re flummoxed, read the previous set of steps.
Press the Menu button.
The menu displays.
Use the Quick Control button to navigate to the Set Up tab and then use the multi-controller button to navigate to the Set Up1 menu.
Rotate the Quick Control dial to highlight Record Func+Card/Folder Sel.
Press Set.
The Record Func+Card/Folder Sel menu displays.
Rotate the Quick Control dial to highlight Record/Play.
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Press Set and choose the desired card.
If you choose the Standard or Auto Switch option for writing images to the CF and SD cards, select the card that will record and play back images.
If you choose Rec. separately or Rec. multiple, select the card that will play back the images.
Press Set.
You’re ready to start creating beautiful images.
Recently, Jeff Cable from Lexar published a blog post explaining a rather curious choice on Canon's part. It seems that the 5D Mark III was built with one very fast CF slot which supports the newer UDMA7 protocol and a standard SD card slot which does NOT support the high speed standard (called UHS). Without UHS support, the top speed that can be achieved by the SD card is 133x. Because the 5D MKIII defaults to the slowest memory card speed inserted in the camera, your CF speed could get short-changed by the SD card.
Jeff explains that he first discovered this problem when he decided to do something that makes perfect sense to a photographer: shoot RAW to one card and JPEG to another, or just shoot RAW to both to act as a backup. But because of the way they designed the SD card slot to work, if you care at all about high speed shooting or clearing you buffer quickly, you do not want to put a card in the SD slot.
What is most painful, but makes sense based on the decision by Canon to not give the SD slot UHS support, is that the 5D MKIII will shoot only as fast as the fasted card inserted. 'So, if you have a 1000x CF card in slot one and any SD card in the second slot, the very best buffer clear that will achieve is 133x. When shooting sports or any type of images with burst mode (6 frames per second), this is crippling.. Why would I want to clear data at 20MB per second when I could be transferring at 90MB per second or better?'
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An excellent question Jeff. What do you all think? Does this problem bother you? Would you have even noticed if Jeff didn't say anything? Let us know in the comments below.
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[Via Jeff Cable's Blog]
Photo copyright Jeff Cable