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Old 28th of April 2012 (Sat)   #1
PressandHold
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Join Date: Apr 2012
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Default SDHC write speed and 1080p/24

Hello Canon experts, I would appreciate your verification of the following please.

The Canon S100 specs say that 1920 x 1080 at 24fps requires 4,355 KB/s. Does this mean an SDHC card faster then 4,355 KB/s write speed will not make a difference in performance?

Likewise a large 16:9 image requires 2,311 KB/s. Does this mean that with a 45MB/s SDHC card write speed, I can snap 1 shot every 50ms?

http://usa.canon.com/cusa/support/co...Specifications

I am confused about whether the Canon specs mean the KB/s required to capture an image and compress it or just to capture it. I don't understand why the specification tables state "RAW" and "JPEG" are "N/A".
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Old 28th of April 2012 (Sat)   #2
lar55
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Default Re: SDHC write speed and 1080p/24

Quote:
Originally Posted by PressandHold View Post
The Canon S100 specs say that 1920 x 1080 at 24fps requires 4,355 KB/s. Does this mean an SDHC card faster then 4,355 KB/s write speed will not make a difference in performance?
Correct. You need a Class 6 card or better, and 'better' probably won't help.


Quote:
Likewise a large 16:9 image requires 2,311 KB/s. Does this mean that with a 45MB/s SDHC card write speed, I can snap 1 shot every 50ms?
No. Your camera has a maximum shot rate of something like 2.3 per second normally.

Quote:
I am confused about whether the Canon specs mean the KB/s required to capture an image and compress it or just to capture it. I don't understand why the specification tables state "RAW" and "JPEG" are "N/A".
If you are looking at the table I think you are ("number of recordable images"), I think this is because RAW format is only available in the native 3:4 aspect ratio.
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Old 29th of April 2012 (Sun)   #3
PressandHold
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Default Re: SDHC write speed and 1080p/24

Thank you for that, lar55.

You just saved me some cash.
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