On supported cameras uses the camera file name as the name of the file saved to the computer. To use the camera file name the Save Media control must be set to Camera + Computer.
When the "Use Camera File Name" is checked then the file name will be set to the "File Name" specified concatenated to camera file name - for example, if the file name is temp, and Use "Camera File Name" is checked, then the file name would be temp_DSC1950.jpg.
The "Use Camera File Name" applies to both the JPG and RAW file names for both the Primary and Mirror/backup files being saved.
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