Canon ECT1-1237-000 User Manual Page 155

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155
Reference
10
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 top 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 names
A file name is assigned automatically to each image
you capture. The file name consists of a unique, four-
character camera code preset at the factory and a file
number assigned automatically. The camera code
cannot be changed. The file number is assigned
automatically according to the numbering method you
selected (p.56).
The extension will be “JPG” for JPEG images or “TIF” for RAW images. For sound files, the
extension will be “WAV.
Firmware
This is software containing various camera control instructions. The EOS-1Ds uses the
firmware for shooting and image processing. Although the firmware is preinstalled in the
camera, you can later install the latest version of the firmware when it becomes available.
5F9Z0001.JPG
Extension
File number
Camera code
(Example)
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