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K100D SR Features
1. The PENTAX Shake Reduction (SR) feature is an electromagnetically 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 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 hold 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.
Power is generated in the direction decided passing an electric current between the coil installed in a central
plate according to rule of Fleming's left hand.
Fleming’s left hand rule
The Thumb represents F - Thrust (or resulting Motion).
The First finger represents B - Field.
The Second finger represents I or V - Current (in the classical direction, from positive to negative).
As a result, photographers can capture sharp images at a shutter speed that is two stops slower
(e.g. 1/15 sec instead 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 considerably when taking non-flash pictures indoors or at dusk or other low
light situations without using a tripod.
Additional Advantages of the PENTAX SR System
• Since the SR system is activated only when you press the shutter release, any effect on
battery consumption is negligible.
• PENTAX SR is optional. You can leave SR on permanently, turning it off only when
using a tripod or panning (deliberately moving the camera in the direction of subject
motion to blur the background).
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