Need SDHC Professional card ?

[trailerparkboy]

Hi,
I need to purchase a SDHC card for my Canon. Looking at 8GB - 9MB per second card, and I see could also get a 4GB 20MB per second card for about same price. Could someone explain what the difference in speed means and if it is worth getting a 'Professional' SDHC card?

Thanks!
TPB

[tirediron]

The difference is the speed at which the camera can write image data to the card. When this becomes is important is when doing continous shooting. If you only ever shoot single images, or take several seconds between exposures, it likely won't matter much.