currently use a 256 gb one, rated for 4k uhd video. At the cheapest quality jpeg setting and small file size, i can get 16,000 images. Trying to find a source for low cost, smaller sized memory cards. So many companies slap "high speed" and "extreme" on cards, its a joke trying to figure out what is what speed wise. Is there a good part number to hunt down.. or just make sure it says "4k UHD video rated"