Because of the greater speed I started using a card reader last week instead of the ist-D's USB cable. I just came back in from shooting the sunset to find that my CF card was still in the reader! I just turned off the "shutter release w/o CF" custom function. This is set to ON by default, what a stupid default setting. The camera does warn you breifly on the LCD, but if you don't notice it you can just go on shooting all day. DOH!
Don
