128MB Compact Flash card

• A 128MB flash card is capable of holding 142 pictures taken with the S300 at its highest resolution. To save more pictures, the camera resolution can be adjusted to 1 megapixel, allowing you to hold twice the number of pictures -- 284.
  
  

256MB Compact Flash card

• A 256MB Compact Flash card is capable of holding 284 high-resolution pictures taken with the S300, or 568 photos taken at a 1-megapixel resolution.
  
  

512MB Compact Flash card

• A 512MB Compact Flash card can hold 568 2-megapixel photos taken with the camera or 1,137 pictures taken at a 1-megapixel resolution.
  
  

1GB

• A 1GB card is capable of holding 1,137 pictures taken with the S300 at a 2-megapixel resolution or 2,274 taken at the lower 1-megapixel resolution.