Compact Flash Speed

Discussion in 'Digital SLR' started by Roger, Jul 19, 2006.

  1. Roger

    Roger Guest

    How significant is the advertised speeds (Ultra, Extreme, Extreme II,
    Extreme III, etc) in reducing write times to the flash.

    I have a Canon 350D (XT) and typically show in Raw mode. Will I notice any
    difference between these higher priced cards vs the cheaper
    run-of-the-mill variety? What about reliability?

    Thanks for your help.
    Roger, Jul 19, 2006
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  2. Roger

    DoN. Nichols Guest

    When *shooting*? Probably not, unless you do a lot of
    burst-mode shooting with lots of shots in a burst. (I don't know what
    the buffer size is in the 350D, and of course it is in part a fucntion of
    image size (JPEG quality or RAW). But when shooting in burst mode, once
    the buffer fills, the camera has to slow down to a frame rate which
    allows it to write out an image to make room for the next one to be
    taken. I, personally, have never encountered the problem with my D70 --
    but I don't do much in the way of burst shooting.

    However, assuming you have a full speed (e.g. USB 2.0) card
    reader, you will probably notice it in how long you have to sit around
    before 1 or 4 GB of images transfer to your computer. That is a *lot*
    of data -- at any speed, and faster means that you can get on to doing
    other things sooner.
    I, personally, have never experienced a failure in a CF card.
    Some have experienced filesystem corruption -- but that could be the
    camera's firmware instead. IIRC, there was a problem in Canon's
    firmware about a year ago, compounded by triggering a glitch in the
    Lexar cards with that camera only. Lexar replaced the cards in question
    (rather slowly, but they did), and upgraded the firmware on the earlier
    returned cards to supply to the later return owners.

    DoN. Nichols, Jul 19, 2006
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  3. Roger

    C J Southern Guest

    Unless you're trying to shoot a "movie" with your 350D you won't notice any
    difference. For the same $$$, I'd suggest getting a bigger card over a
    faster card any day of the week (including Sundays and public holidays)
    C J Southern, Jul 19, 2006
  4. Roger

    Bill Guest

    For info on card performance with your camera, read this:

    Click the drop down menu on the right and select your camera to see
    results. Some of the data may seem old, but it's all relative and still
    relevant to your choices.

    Personally, I chose a fairly fast card not so much for the camera, but
    for the card reader. The camera buffers images so unless you shoot very
    large amounts of bursts, the buffer will handle the slow cards.

    But when I transfer the images to my computer, I want it to be fairly
    quick, so I chose a card for that purpose. I'm using Sandisk Ultra II
    cards which are almost as fast as the Extreme cards but costs less.
    Bill, Jul 19, 2006
  5. Roger

    Roger Guest

    Thanks to all for your responses!
    Roger, Jul 19, 2006
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