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FORUMS Photography Talk by Genre Sports Talk 
Thread started 01 Dec 2015 (Tuesday) 20:56
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7D2 saving photos to dual cards

 
mikepj
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Dec 01, 2015 20:56 |  #1

I just bought a 7D2 last week, and I have a question about writing photos to dual cards.

I have mine setup to write RAW to a CF card, and JPEG to an SD card, figuring it would be a nice way to have a backup while not having two RAW images floating around. My question is how this kind of setup affects the buffer size of the camera when shooting in high speed mode for sports. I was photographing my daughter's gymnastics and it felt like my buffer was filling faster than expected, and then I had to wait quite awhile for the buffer to finish writing before being able to view the photos (or take more).

Am I running into a shorter buffer because of the RAW + JPEG setting? I thought the buffer wouldn't be an issue here since I am writing to two separate cards (thinking that the card write speed would be the bottleneck). But it felt like it was filling about as fast as RAW+JPEG to a single card would be. My cards aren't cheapies by any means, but aren't top of the line either: Sandisk Extreme 60MB/s CF, and a Lexar Platinum II 200x SDXC.

If the JPEG processing is taking extra buffer space and/or slowing things down, would writing RAW to both cards be faster? Or should I just disable writing to the second card when shooting sports?


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ChunkyDA
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Dec 01, 2015 21:53 |  #2

RAW and jpeg you are asking the camera to do two different actions regardless of one or two cards. two cards should be faster since the data pipe is bigger. Are you saving large jpegs? You are at the mercy of the slowest card in either case. CF cards are usually faster (within reason) than SD no matter what the speed written on the card. You can research this fact and the reason. When I use two cards in my 5D3 my SD is an eyefi writing small jpeg files so I can live tweet images of the event I am covering by sending pictures to my phone. RAW goes to the CF card. The eyefi always slows down my write speed and the ability of the camera to take a burst of images, even though the small jpeg is far smaller than the full RAW files.


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Lyndön
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Post edited over 3 years ago by Lyndön.
     
Dec 02, 2015 01:12 |  #3

I would think the 7DII should outperform the 5DIII in this regard though, since it actually has two high speed slots... unlike the crippled SD slot on the 5DIII.

My guess is that the Lexar 200x card is your biggest problem, but neither of those are really fast cards. For max performance you'll need a faster card in both slots, and you'll be limited by the slowest one, as said before.

This might help...

http://www.cameramemor​yspeed.com …st-sd-cf-card-comparison/ (external link)


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mikepj
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Post edited over 3 years ago by mikepj.
     
Dec 02, 2015 08:47 |  #4

Thanks for the responses. I am writing large JPEGs to the SD card. Maybe I'll try switching to small JPEG and see if it's a slower card killing the speed. I didn't pick this SD card, it came in a bundle with the camera. I would have sprung for something a little faster otherwise.

That EyeFi sounds like a pretty slick workflow. A nice alternative for cameras like ours that lack WiFi otherwise.


Radiant Photography (external link) Instagram (external link) Instagram (Sports) (external link) Flickr (external link)
5D Mark IV, 7D Mark II, Rebel SL1
16-35 ƒ4L, 24-105 ƒ4L, 70-200 ƒ2.8L IS II, 100-400 ƒ4.5-5.6L, 85 ƒ1.8, 50 ƒ1.8 STM, 24mm ƒ2.8 STM

  
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mikepj
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Dec 02, 2015 10:19 |  #5

After doing some further tests, my SD card is definitely slowing the camera down. Saving JPEG small to the SD card improves things a little. Switching off the SD card improves things dramatically. I'll look into picking up a Sandisk Extreme Pro as recommended by the cameramemoryspeed.com link above.


I also wanted to post the following tidbits as general information to people who are searching for this topic later on…

I noticed that after the buffer filled up, my camera would stop taking photos even if I continued to hold down the shutter button. I was using firmware 1.0.2 (which came with the camera). Upgrading to firmware 1.0.5 fixed the problem and now the camera will continue to shoot at a lower speed after the buffer fills.

The 7D Mark II will fit more frames into the buffer if you disable all the lens aberration corrections (peripheral illumination, chromatic aberration, and distortion). That increased my buffer from 15 frames to 20 frames (RAW + JPEG).


Radiant Photography (external link) Instagram (external link) Instagram (Sports) (external link) Flickr (external link)
5D Mark IV, 7D Mark II, Rebel SL1
16-35 ƒ4L, 24-105 ƒ4L, 70-200 ƒ2.8L IS II, 100-400 ƒ4.5-5.6L, 85 ƒ1.8, 50 ƒ1.8 STM, 24mm ƒ2.8 STM

  
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7D2 saving photos to dual cards
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