Canon EOS 10D EOS 10D INSTRUCTIONS - Page 161

Basic Terminology Aperture The aperture value (f/number) indicates the size of the aperture opening in the lens. It is equal to the focal length devided by the aperture diameter. It adjusts the amount of light striking the CMOS sensor. The aperture value is displayed on the camera's LCD panel and in the viewfinder. It can range anywhere from 1.0 to 91, depending on the lens attached to the camera. Shutter speed The shutter speed is the length of time the camera's shutter opens to expose the CMOS sensor to the light coming through the lens. It adjusts the amount of light striking the CMOS sensor. Format When you format a CF card, it prepares the card to store data in it. It also erases any data stored on the card. Before formatting a CF card, be sure it has no valuable data. File numbers and folders The captured images are automatically assigned a file number from 0001 to 9999 and stored in a folder that can contain up to 100 images. The folders are numbered from 100 to 999 and stored in the CF card. The file name of JPEG images will be "IMG_ " appended with the ".JPG" extension. RAW image file names will be "CRW_ " appended with the ".CRW" extension. Image file names with the ".THM" extension are thumbnail image files for the index display. Example: IMG_0001.JPG File name Extension File number - 100 0001 0002 0099 0100 - 10. 1 0101 0102 0199 0200 . . - 199 9901 9902 9999 - 200 0001 0002 0099 0100 Firmware This is software containing various camera control instructions. The EOS 10D uses the firmware for shooting and image processing. Reference 13 161