In my Pentax ist Ds I have a SanDisc Ultra II 1gig SD Card. The advertized write speed of this card is 9 megabytes/second. I can't find the max write speed of my camera and I'm wondering how I can figure it out. The camera will take 3 pictures, or so, very quickly till the camera's memory is full. From then on, I assume the rate at which it will take pictures is limited by the write speed of the camera/card combination. If I time how long it takes to take, say, 30 pictures and do the math, will I have a fair approximation of my write speed? And if it's around the supposed write speed of my card, can I assume spending money on a faster card is a waste of money or will there be some other benifit of which I am not currently aware? I can't imagine this really being much of a problem. Odd, the places the mind goes when it's allowed to wander, huh?