Canon PowerShot G3, Service Manual

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1-7
2 Features
2–1 High Image Quality
- High-resolution large-aperture (f/2.0 to 3.0) 4x zoom lens (35 mm film equivalent: 35 to 140
mm)
The photo lens of the PowerShot G3 is a 4x zoom lens with a focal length of 7.2 to 28.8 mm (35 mm film
equivalent: 35 to 140 mm) that permits a wide range of photography from scenery to snaps. An aperture f
number of f/2.0 to 3.0 is realized at the same time as providing four-times zoom magnification.
The lens is constructed in four blocks with an 8-element, seven-group construction including an aspherical lens.
Focusing is achieved with a rear-focusing method that moves only one lens surface. Minimizing the number of
focusing lenses achieves higher speeds and saves energy.
- High definition and fast processing with the newly developed “DIGIC (Digital Imaging Processor)”
The PowerShot G3 comes equipped with the “DIGIC
(Digital Imaging Processor)
”, a newly developed image
processor. DIGIC
(Digital Imaging Processor)
achieves enhanced high picture quality by improving signal processing
algorithms as the successor of new DIGIC
(Digital Imaging Processor)
.
The following
*
are the main advances of the DIGIC
(Digital Imaging Processor)
.
• Improved picture quality
• Improved AF accuracy
• Improved processing speed
* DIGIC (Digital Imaging Processor) features many improvements, but the three points above are the principle
contributions to the PowerShot G3.
Figure 2–1 Block diagram
Lens/CCD
DIGIC
(Digital Imaging
Processor)
Flash
PROM
CPU
LCD
CF
Card
SDRAM
USB
VIDEO
AUDIO