> Wouldn't SD cards be preferable? They support the MMC standard by
> default, have a simple interface (SPI) and mirrored redundancy is
> fairly easy with a SPI port.

The reason that CF predominates in the professional and higher 
performance camera market is probably its interface speed due to the 
parallel interface. No doubt serial interfaces can be made suitably 
fast (cf eg 'Firewire', USB2, SIDE) but CF does very well at present.

Also, if one has a camera that writes to a CF card already then it's 
liable to be simpler to stick with that if possible.

Also, if the camera is CF and a 2:1 head can be added or not as 
required the same cards can be used in either mode. I anticipated a 
dual head being external to the camera but attached - probably 
underneath as other accessories such as vertical grips and extra 
battery cases are.



        Russell McMahon

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