The COOLPIX S6500 can be used with or without a memory card. However, the number of images that can be stored on the S6500's internal memory will vary depending on your image settings - about 5 images can be saved with the camera at its default settings. This number can be increased by changing the S6500's image mode settings to smaller image sizes, but image quality will decline with a decrease in image size.
A list of approved memory cards for the COOLPIX S6500 can be found on page 22 of the Technical Notes and Index section of the S6500 manual.
See page 49 of the reference section of the S6500 manual for a chart showing the approximate number of images that can be saved to a 4GB card at different image mode settings.
A copy of the COOLPIX S6500 manual can be downloaded from this address:http://support.nikonusa.com/app/ans...