Neilp Loc: Jersey, C.I.

Just got a a 5D MkIII, and at home can use the EOS software to transfer files just fine.
It does not appear on the Mac as an external drive, but that is not a problem as I have the EOS utility software

But...

I am off on holiday, and won't be able to install the software on every computer I want to plug the camera in to, to take the photos off the CF card to backup to external drive/usb/ give to friends etc.

OK, other solutions are an EyeFi card, Spare CF/SD cards and a card reader, but that is all extra stuff.

So i am trying to see if there is a way to just plug the camera in to USB on PC or mac and have it appear as an external drive?

I see a Communication option in the 'My Menu ' custom functions, but it always seem to be greyed out

FilmFanatic Loc: Waikato, New Zealand

Canon cameras do not support mass storage mode, or at least my 30D did not, so they will not appear as a drive. A card reader is quite small and inexpensive, I think I used the USB cable once and threw it away in frustration, I found a card reader much better

Neilp Loc: Jersey, C.I.

Bugger
I have loads of card readers, just wanted to reduce what I am carrying