PENTAX Shake Reduction
The PENTAX K100D digital SLR incorporates a unique
shake reduction feature that helps deliver sharp, blur-free,
handheld shots with any PENTAX SLR lens. This is par-
ticularly helpful in situations where camera shake is an issue,
such as with telephoto lenses, indoors without a flash, or
other low light conditions such as at dawn, dusk or at night.
The PENTAX Shake Reduction (SR) feature is an electro-
magnetically controlled system built into the body to detect
handheld camera shake and compensates by moving a free
floating image sensor. Unlike other DSLR optical anti-shake
systems, this SR system delivers shake reduction with all
PENTAX SLR lenses ever manufactured without requiring a
special series of bulky, expensive optics.
Over 30 patents have been filed for this SR system, which
uses a ball-bearing-mounted oscillator unit with four
electromagnets that position the free-floating image sensor.
Angular velocity sensors detect camera movement and relay
the amount of compensation necessary to the electromagnets
that move the sensor to compensate for any shake.
As a result, photographers can capture sharp images at a
shutter speed that is 2 to 3.5 stops slower (e.g. 1/15 sec in-
stead of 1/60 sec with a standard lens) than would otherwise
be possible. The SR system provides a crucial advantage
when shooting handheld with telephoto or tele-zoom lenses,
at macro distances, or any other situation that magnifies the
effects of camera shake. The SR system also helps consider-
ably when taking non-flash pictures indoors or at dusk or
other low light situations without using a tripod.
Based on a free-floating sensor design, PENTAX SR is superior
to other sensor-moving systems because it uses no guide rails,
allowing the sensor to oscillate at a quicker response time.
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