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If you have one, your User Guide/Instruction Book/ on-screen Manual should be able to help you. For example, I have a Canon A710IS, and under “Memory Cards and Estimated Capacities” for a 512 SD memory card it it goes from 156 for ‘Large (3072×2304 pixels)’ to 839 for ‘Postcard (1600 x 1200 pixels)’.
