Canon PowerShot A100, Руководство по обслуживанию

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z AF maintains image focus at any distance
Although most cameras in this class typically use fixed-focal-length (pan) focus, the PowerShot A200/A100 is
equipped with high-precision AF. This allows sharp images to be obtained regardless of distance to photographic
subject. Also, the normally unusable focal range for most such cameras between the macro focal plane and the
minimum normal focal plane from 5 cm to infinity, becomes possible.
z Intelligent AE determines optimum exposure in all photographic situations
To achieve precise exposure control with the PowerShot A200/A100, the intelligent AE system that has been
used since Spring 2001 is adopted. The major features are (1) 3-point AF-linked AE, (2) low brightness/back-
ground lighting correction, and (3) close-up flash correction. Therefore, under conditions usually prone to expo-
sure errors, and when the flash is used in low brightness, with background lighting or close up, more precise
exposure can be obtained than was previously possible.
z High-precision white balance (auto, plus five preset positions)
With the PowerShot A200/A100, the whole screen is divided into many blocks from which calculation data for
white balance is collected, allowing precise control.
Also, as with the PowerShot G2/S40/S30, the Fluorescent Lamp preset white balance position is subdivided into
two settings, called Fluorescent Lamp and Fluorescent Lamp H, for a total of five setting positions. Recently,
color rendering of fluorescent lamps has varied, covering a wide range of high and low color temperature
objects. Therefore, the Fluorescent Lamp position supports relatively lower color temperatures such as “white”
and “daylight white”, and the Fluorescent Lamp H position supports relatively higher color temperatures such as
“daylight color”. The regular light bulb position is also used for incandescent-colored fluorescent bulbs.
z Wide range of ISO-equivalent speed settings (Auto, ISO 50(A200)-64(A100)/100/200/400 equivalent)
The PowerShot A200/A100 user can select ISO speed equivalent to film ratings of ISO 50(64), 100, 200 and
400. For example, in a bright environment where there is no need to worry about camera shake, the ISO 50(64)
setting can be selected to provide low noise conditions for highest image quality, and in a dark environment, the
ISO 400 setting can be selected to minimize the effects of camera shake. During auto operation, the camera
selects the optimum value from 50(64) to 140 (50(64) to 150 with the flash, or for movies 50(64) to 280 for
QVGA, and 50(64) to 560 for Q
2
VGA.)
White Balance
Preset Position
Three-wavelength type fluorescent light designed to mimic incandescent light Incandescent
Daylight white fluorescent light, white fluorescent light,
daylight white three-wavelength type fluorescent light
Daylight fluorescent light, daylight three-wavelength type fluorescent light
Fluorescent H
Types of Fluorescent Light
Fluorescent
Table 2-3 Types of fluorescent light and white balance preset position