the user can shoot up to an ISO sensitivity level 2-stops higher with the same noise
performance.
This leap in noise performance has allowed some significant changes to the camera
operation:
In Auto ISO: the maximum high ISO speed chosen by the camera has been
raised to ISO 1600 (ISO 400 in previous comparable products). This means that
camera shake and subject blur is reduced when shooting in Auto modes in dark
scenes.
When using the flash with Auto: the maximum ISO has increased to ISO 800
(ISO 250 in previous comparable products) thus extending the flash effective
distance and allowing brighter backgrounds in dark situations with flash.
Dynamic range: the dynamic range has been greatly expanded to a level
approximately four times greater than the previous comparable products. This
means great improvements in shadow details and reduction of highlight
blowout in scenes with large differences in contrast.
Low Light Mode: the shooting mode previously named ISO 3200 Scene Mode
has been changed to Low Light mode with a number of enhancements. In a
reduced 2.5MP resolution, the camera chooses from ISO between ISO 320 and
ISO 12800 to enable you to shoot in darker scenes than ever before without
having to use flash. In Low Light mode, the PowerShot S90 can also shoot
continuously at a fast 2.1fps.
DIGIC 4
Canon’s DIGIC 4 (Digital Imaging Core) image processor manages all of the camera’s
primary functions to optimize operating efficiency. Advanced image processing
algorithms deliver superb image detail and colour reproduction with accurate white
balance. High-speed processing results in outstanding responsiveness, rapid auto focus
and extended continuous shooting ability.
DIGIC 4 also powers advanced Noise Reduction Technology within the
Dual Anti-Noise System, i-Contrast, Face Detection AF/AE/FE/WB and Scene Detection
Technology.
Optical Image Stabilizer (4-stops)
The PowerShot S90 uses a lens shift-type Image Stabilizer (IS) system to detect and
correct slight camera shakes that can cause image blur. The IS delivers a 4-stop
advantage for improved performance in low-light conditions, when shooting at the
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