Canon EOS Digital Rebel White Paper - Pagina 9

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operation. Also, if the self-cleaning unit is operated 5 consecutive times within 10

sec., it will not work for 10 sec. afterward. Turning the power off does not reset this.

The restriction does reset if the cleaning function is not activated for at least 60 sec-

onds. While the self-cleaning unit is disabled, if you select [Sensor cleaning: Auto] from

the menu, the [Clean now] option will be grayed out and cannot be selected.

Two kinds of dust are less likely to be moved by the accelerations of the vibrating LPF:

small and light particles and the dreaded sticky stuff. In the event that the Self Cleaning

Sensor Unit cannot remove all the dust, the Dust Delete Data (the size and position of

dust too small or too sticky to remove with the Self Cleaning Sensor Unit) is obtained and

appended to the image so that Digital Photo Professional Ver. 2.2 can erase the remain-

ing dust spots on the image automatically. The shadows created by the dust particles

adhering to low-pass filter #1 are detected by the imaging sensor. The most troubling

dust particles, mostly the

larger ones, are then sin-

gled out and their location

coordinates are obtained

as Dust Delete Data. This

data is attached to the

image. After the shutter is

released, it takes about 6

sec. to obtain the Dust

Delete Data.

To obtain Dust Delete Data, begin by taking a picture of a solid white, patternless object

(such as a piece of white paper) which is quite out of focus despite the use of a small

aperture. Use a 50mm or longer lens with manual focus set to infinity. The object

should be about 1 foot from the camera. Any common light source is fine. Fill the

viewfinder frame. (The image data can be obtained even without a CF card installed in

the camera.) When the screen in step 4 appears, the camera will be set automatically

as follows: shooting mode, aperture-priority AE; aperture, f/22; shutter speed, 1/2 sec.

or faster; ISO Speed, 800***; flash, off; drive mode, single.

Even if the focus mode is set to <AF>, manual focus will still take effect, and even if a CF

card is installed in the camera, the image taken for the dust deletion will not be record-

ed. If the picture was overexposed or underexposed by 2 stops or more or if the lighting

of the white paper was very uneven, the Dust Delete Data cannot be obtained properly

and a message telling you to try again will appear on the screen. The Dust Delete Data

obtained is subjoined to both the JPEG and RAW images regardless of the shooting

mode. The data is only a few kilobytes, so it will not affect the continuous shooting

speed or maximum burst. It is attached to all subsequent images until it is updated

again (via the procedure described here). It is recommended that the Dust Delete Data

be updated before a big shoot or after changing lenses in a dusty place.

III. FEATURE DISCUSSION

Steps to obtain dust delete data

Self-cleaning sensor

system operates.

Picture

taken.