Canon s2 12x optical zoom Maybe I'M missing something with the different ans you're getting.
According to CameraWorld.com a digital image calculator shows if you shoot at your best setting of 5 megapixels you should get about 409 shots on a 1 GB card. If you use a less quality setting (and I wouldn't-you have a real fine camera) say 3MP, you should get about 853 shots. Depends on the megapixels of your camera. it dependa on the resoultion (quality) of the pic. the higher the qualtiy the less it will hold and the l;ower the quality the more pics it will hold It depends on the megapixels in your camera. Your S2-IS is a 5 MP camera.
You must understand that this information is based on using the highest resolution, largest image a 5 MP camera can produce. If you use smaller sizes, the storage capacity increases immensely.
Put the card in your camera and see how many frames it says you can still hold on the card. That's the only really accurate way. Well, even that is an approximation, because the camera does not know how large your next picture will be. It's like your car predicting how many miles of fuel you have remaining in the tank when it doesn't know if you are about to smash the gas pedal to the floor. For instance, if you take a picture with a lot of more-or-less uniform sky in it, the memory used for a full 5 MP picture will be considerably lower than a 5 MP picture with huge amounts of detail.
If you are thinking of buying a 1 GB card and don't have one to check by putting in your camera, look in your owner's manual. They might limit their listing to something like 256 KB, but you can just multiply that amount by 4, since 256 KB times 4 is 1 GB.
If you lost your manual, you can do some estimates and some calculations. A 5 MP camera will make files about 3-3.5 MB in size for an "average" full size, maximum resolution picture. Sometimes more and sometimes less. The theoretical MAXIMUM would be 5 MB, right?
One billion divided by 5 million = 200 pictures.
If the file size if more like 3.5 MP, though:
One billion divided by 3.5 million = 285 pictures.
Do the math to draw your own conclusions about lesser file sizes.
If you shoot a mid-size photo with "normal" resolution, you might even be able to get about a thousand on the card. Check your manual for details.
http://www.lexar.com/digfilm/capacity_ch... shows various card sizes with various MP cameras. Depending on the quality of the photo you select, 8000 on your smallest setting to 370 on your highest setting. About 350-400 | 