How can you tell how many pictures you can take on a camera?

That all depends what size card you have, resolution of the pictures, and if the camera has the video feature. Nowaday, there's no worries of running out of gigabytes.

The formatting of this may or may not come out very well but if you know that there are 7 size columns & 7 image columns, you can virtually line these up for the answer. Camera Type\size //32MB //64MB //128MB //256MB //512MB //1GB //2GB 2 megapixel 35 71 142 284 568 1137 2274 3 megapixel 26 53 106 213 426 853 1706 4 megapixel 16 32 64 128 256 512 1024 5 megapixel 12 25 51 102 204 409 818 6 megapixel 10 20 40 80 160 320 640 The number showed on each cell indicate the images you can save with the memory card. Average file size using "high-resolution" JPEG mode. Actual images may vary depending on camera model and complexity of scene being shot. MB = Megabytes, GB = Gigabytes How much music will your flash card hold? mp3 //128MB //256MB //512MB 32 songs 64 songs 128 songs Based on songs encoded at 128kbps bits rate. Actual formatted capacity may vary depending upon manufacturer specifications Then the link below, to casio, is a very long article but within the page are a couple of graphs which show it better according to sensor size. And just for the fun of visiting my blog, http://outsideshooter.blogspot.com/

7 mega pixel or more cameras are the best option to get.. Almost all the digital cameras with 7 megapixel can store around 130 shots on a 512 MB storage..