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General photography questions and answers: Discuss Udma compact flash cards...Hi Bought a UDMA card for my Canon 1D Mk111 it works, but i am not sure if I am ...
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Old 07-11-2011, 16:09   #1 (permalink)
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Udma compact flash cards

Hi
Bought a UDMA card for my Canon 1D Mk111 it works, but i am not sure
if I am getting 60MB/s when using camera ?
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Old 07-11-2011, 16:29   #2 (permalink)
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Re: Udma compact flash cards

The camera write speeds will be in the manual. What speed do you think you are getting?
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Old 07-11-2011, 16:39   #3 (permalink)
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Re: Udma compact flash cards

How can you tell ?
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Old 07-11-2011, 18:49   #4 (permalink)
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Re: Udma compact flash cards

Thanks Dadhand16 but I don't have the manual,and was going to ask the same question as Neon-How can you tell,
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Old 07-11-2011, 19:20   #5 (permalink)
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Re: Udma compact flash cards

Well according to Rob Gailbraith's tests, the file writing speed varies with the card used and the file type, but the maximum that his tests got was under 15MB/s.

Rob Galbraith DPI: Canon EOS-1D Mark III

As to how you tell what speeds you are getting the Gailbraith tests seem to time the writing by looking at the write light and presumeably then checking the file size of the files and adding them up then dividing by the time taken.

In normal use, there is no way of telling and even with big test differences between the cards it would be hard to tell - that is why I asked what speeds you thought you were getting. If you use a high frame rate regularly you might see more of a difference, but even then once you get away from the lowest speed cards I don't think that there will be a significant difference.

Your card might well be capable of achieving 60MB/s, but if the camera hardware cannot write at that speed there is no advantage to be gained and you might be better getting several slower cards as you will have a greater capacity for your money.
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Old 07-11-2011, 19:28   #6 (permalink)
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Re: Udma compact flash cards

IIRC the 1D3 is capped at 30mbs and that is no guarantee you will get 30, probably most unlikely.
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Old 07-11-2011, 20:00   #7 (permalink)
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Re: Udma compact flash cards

Thanks for info lads. Graham those test results are interesting, is it saying that raw reads faster than jpeg.
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Old 07-11-2011, 20:19   #8 (permalink)
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Re: Udma compact flash cards

Quote:
Originally Posted by 051charlie View Post
Thanks for info lads. Graham those test results are interesting, is it saying that raw reads faster than jpeg.
I think that they are write speeds and it might be that RAW is faster than jpg because there is no processing done to a RAW file where the camera will be applying sharpening, saturation and contrast etc settings to the jpg files.

I know that you are probably thinking that sports togs normally shoot in jpg for write speed, but I'm guessing that the jpg's in the Gailbraith tests were probably not at the lower end of the scale of quality and size. A good quality large jpg will have a hefty file size, so will take longer to tuck away.

Ha!! I'm right (or write) I've just looked at the test again and

Quote:
write 20 Large (Quality 8) JPEG
So this will explain the write speeds I think.
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Old 07-11-2011, 20:51   #9 (permalink)
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Re: Udma compact flash cards

Yes I see they used Q8, it might have been better if they used max Q as I would think most people would shoot that way,what do you think. Is there much difference between 8 &10. I know I should do a test myself but
would like your opinion

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Old 07-11-2011, 21:21   #10 (permalink)
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Re: Udma compact flash cards

Sorry never use jpg in camera so have not got a clue regarding quality.

When I save images for web in jpg form - at low res - at the sizes I use I don't see any differences in appearance, just a difference in the file size. But I emphasize that this is for web display use, original large high quality jpgs might well be different.
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