3x zoom, at times I wish it had 10x. Comes with 4 meg card, will accept 8 meg card. Will use 16 meg card after being sent back to manufacturer for modification. Takes approx 5 seconds between shots to save image to memory, so rapid action sequences are not possible. Pop up flash unit works great, but no jack for external flash.
Battery life is terrible.
There is a jack for external power. Downloads via serial port to computer. Seems to take forever. A few weak areas reduces a 5 star camara to 3 stars. The 620 fixes every shortcoming of the 600, with the exception of the 3x zoom.