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FORUMS Canon Cameras, Lenses & Accessories Small Compact Digitals by Canon
Thread started 28 Apr 2012 (Saturday) 18:51
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SDHC write speed and 1080p/24

 
PressandHold
Hatchling
2 posts
Joined Apr 2012
Apr 28, 2012 18:51 |  #1

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 ...rshot_s100#Specific​ationsexternal link

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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lar55
Senior Member
273 posts
Joined Dec 2010
Apr 28, 2012 19:29 |  #2

PressandHold wrote in post #14345213external link
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.

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.

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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PressandHold
THREAD ­ STARTER
Hatchling
2 posts
Joined Apr 2012
Apr 29, 2012 19:29 as a reply to lar55's post |  #3

Thank you for that, lar55.

You just saved me some cash.




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SDHC write speed and 1080p/24
FORUMS Canon Cameras, Lenses & Accessories Small Compact Digitals by Canon


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