Canon EOS 10D instruction manual Aperture, File numbers and folders, Firmware

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, depend- ing 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
			–
101	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.

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Reference

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