john b gynell Posted May 25, 2007 Share Posted May 25, 2007 Does anyone know of any coversion charts that gives you the amount of images you could take per memory card size and megapixel setting on your camera. I know the camera will tell me the amount of images it will hold per setting, but I am looking for a chart with this information before hand too help me with my present and future memory card purchases. ie.- How many images will fit on a 4gig card, shooting at 2 megapixels, or at 10? Tahnks, John Link to comment Share on other sites More sharing options...
brucecyr Posted May 25, 2007 Share Posted May 25, 2007 Sorry I don't have the requested link, but once you have a value for a given IQ setting and card size, you can multiply or divide to get an estimate. For example, RAW only on my 350D with a 2GB card tends to come in around 200-233, so 4GB would be twice that, 1GB half that. Usually the camera underestimates. For example, I had a hot finger this morning and packed 275 onto a 2GB card -- real pity that because the HD won't take another byte till I do some pruning. But you just can't resist your first Baltimore Oriole sighting of the season :-) Link to comment Share on other sites More sharing options...
Rich B NYC Posted May 25, 2007 Share Posted May 25, 2007 John, While it sounds simple to compile such a chart, there are many variables. Not the least of which is camera make and model. The firmware alogrithms that manufacturers use are all over map. As you may know, the size of a file is dependent upon not only the megapixel setting, but the file type as well. An uncompressed RAW file can take up as much space as 20 jpegs (for example). To complicate things further, the complexity of the subject matter can also affect file size. In other words, a shot of a blank wall will use fewer pixels than a shot of a detailed landscape. Anyway, I see where you're going with this but there can be no chart that's 100% accurate under all conditions. The best that you can hope for is an approximation based on the chart in the instruction manual for a given camera. Link to comment Share on other sites More sharing options...
emre Posted May 25, 2007 Share Posted May 25, 2007 A Canon Xti set to RAW will take about 400 pictures on a 4GB card. Link to comment Share on other sites More sharing options...
Jochen_S Posted May 25, 2007 Share Posted May 25, 2007 Suggestion: read your camera's manual. (Many are downloadable as PDFs.) Megapixel don't mean everything. Here I can choose between 3 JPG compressions and at full res also RAW and Tiff. Tiffs are the only files of predictable size. The amont of JPGs is subject dependant, more details mean less frames. RAW sizes vary sometimes even between different models of the same manufacturer. I doubt that your framecounter will give you the desired answer, since my own ones have only 3 digits, which aren't enough for the low res JPGs. I'd guess you might get between 2400 - 6000 2MP JPGs on your card (numbers pessimistic according to a Pentax 1.5MP chart highest and lowest JPG compression) Link to comment Share on other sites More sharing options...
ericreagan Posted May 26, 2007 Share Posted May 26, 2007 This one's a little dated, only goes up to 8MP: http://www.camerafarm.com.au/camera/customer/pages.php?pageid=22 Cheers! Link to comment Share on other sites More sharing options...
jcuknz Posted May 26, 2007 Share Posted May 26, 2007 The content of the shot alters its file size so you can only get a rough idea based on an average type of shot. Link to comment Share on other sites More sharing options...
ted_marcus1 Posted May 26, 2007 Share Posted May 26, 2007 The size of a compressed file (raw or JPEG) varies not only with the subject matter, but with the ISO setting. Compression depends on removing redundancy within a file. Noise at high ISO settings is random, so compression can't work well. A noisy file is a large file. It's possible to make a reasonable estimate of images per gigabyte based on average file sizes. But you really can't rely on it. Link to comment Share on other sites More sharing options...
J.W. Wall Posted May 28, 2007 Share Posted May 28, 2007 Camera manual probably has a list, or you can check the camera manufacturer's online info. Link to comment Share on other sites More sharing options...
phule Posted June 9, 2007 Share Posted June 9, 2007 Given the increasingly low costs of memory cards, such a chart (to me) has very little value. When in doubt, buy another card. Link to comment Share on other sites More sharing options...
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