CF card speed for hd video

Discussion in 'Digital Video' started by jetjaguar, Mar 10, 2011.

  1. jetjaguar macrumors 68030

    jetjaguar

    Joined:
    Apr 6, 2009
    Location:
    somewhere
    #1
    I have a 7d and I was wondering how important cf card speed is
    currently i have a transcend 16gb 400x .. says the write speed is 30mbps ..
    is that fast enough because I see lexar has 600x cards with 90mbps write ..
    on cinema5d.com most of them use kingston 133x .. I guess that just answers my question but I wanted to get some opinions here
     
  2. tmagman macrumors 6502

    Joined:
    Nov 7, 2010
    Location:
    Calgary AB
    #2
    i have a couple Lexar 16GB 233X cards for my 7D and they work great. Shot lots of video at 1080x24 and 30 and also 720x60 and absolutely no problems with write speed, even for full length (4GB) videos. Continuous shooting at the 8fps on the 7D is also great, very long bursts capable with the 233X (approximately 30MB/s) cards.

    The 400x will perform great for you (although remember there are a couple different speed multipliers for '_ _ _ x'... so the actual number of MB/s may vary) 300x is around 45MB/s (not mbps like you posted).

    Hope that helps!
     
  3. gameface macrumors 6502

    Joined:
    Sep 11, 2010
    Location:
    Boston, MA
    #3
    I use Transcend 32GB 400x cards with my 7D and have had zero issues.
     
  4. jetjaguar thread starter macrumors 68030

    jetjaguar

    Joined:
    Apr 6, 2009
    Location:
    somewhere
    #4
    like i said i have the Transcend 400x 16gb card .. but it says that it is only 60mb/s read and 30mb/s write which is slow isnt it for a 400x card ?

    your 233x card is prolly faster than my 400x .. i just wanna make sure i make the correct purchase .. i only have one right now but i am planning on picking up a 2nd one

    also curious what cf card readers are you guys using ?? i need to pick one up and i dont really feel like spending 100+ for a firewire one
     
  5. gameface macrumors 6502

    Joined:
    Sep 11, 2010
    Location:
    Boston, MA
    #5
    What I don't get is what you are asking? You asked if the card is fast enough. You have the camera, you have the card, try it out. Like I said, that card works fine for me with that setup and they're cheap. Do you really care about read speed when you are dumping your card at the end of the day? Do you NEED the fastest card? You need something that works and that card works.

    And a card reader... how about $5 for a USB2? http://www.bhphotovideo.com/c/product/462560-REG/Jobo_SE9231_SE9231_23_in_1_USB_2_0.html
     
  6. CaptainChunk macrumors 68020

    CaptainChunk

    Joined:
    Apr 16, 2008
    Location:
    Phoenix, AZ
    #6
    1080p/24 video from the EOS 7D is about 48Mbps, or 6MB/sec. That should give you an idea of how fast of a card you really need for using the camera in video mode. Although it is nice to have a card with fast read speeds when it's time to dump the card.

    The ultra-fast CF cards (like UDMA 6) are mostly only necessary for still photographers that quickly shoot using fast cameras in RAW format, where individual images can be 30MB+ and their recording delays need to be a fraction of second.
     

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