Features; High Image Quality - Canon PowerShot A30 Service Manual

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2 Features

2-1 High Image Quality

New image capturing optics brings out high resolution (PS A40)
The PowerShot A40 uses the same CCD as the PowerShot A20, but with its characteristics improved by
partial modification of the image capturing optics, resulting in better resolution than the PowerShot A20.
High-precision white balance (Auto + Five preset positions)
With the PowerShot A40/A30, the whole screen is divided into many blocks from which RAW calculation
data for white balance is collected, to allow 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, fluorescent lamps have appeared with a variety of color hues, compose of many high and low color
temperature objects. The single Fluorescent Lamp white balance setting is unable to support all of these
variations. The Fluorescent Lamp position now 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.
Three-wavelength type fluorescent light designed to mimic incandescent light
Daylight white fluorescent light, white fluorescent light,
daylight white three-wavelength type fluorescent light
Daylight fluorescent light, daylight three-wavelength type fluorescent light
Table 2-1 Types of fluorescent light and white balance preset position
Wide range of ISO-equivalent speed settings (Auto/ISO 50/100/200/400 equivalent)
The PowerShot A40/A30 user can select ISO sensitivity equivalent to film ratings of ISO 50, 100, 200 and
400, just as one would select a file speed for a silver-halide camera according to the photographic conditions.
The low-sensitivity ISO 50 setting is best for still subjects unaffected by a slow shutter, or subjects in a bright
environment where there is no need to worry about camera shake, because of its superior noise characteristics.
On the other hand, while the ISO 400 setting has the disadvantage of lower S/N, it is appropriate for low-light
conditions where a strobe cannot (or should not) be used, or when a fast shutter speed is needed.
Taken by ISO 50 (Outdoor)
Photo 2-1 Characteristics comparison between ISO 50 and ISO 400
Types of Fluorescent Light
1-6
White Balance
Preset Position
Fluorescent
Fluorescent H
Taken by ISO 400 (Indoor / No flash)
Tungsten

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