The K100D is a compact well specified D-SLR that in terms of its retail price takes on the likes of 
Nikon’s D50 but is specified closer to the Canon EOS 400D. It also replaces its predecessor, the *ist DS2. There’s a lot of camera here for your money, so let’s have a look at what you get.
To start, the camera features a now fairly standard 6.1-megapixel CCD but mounted upon a proprietary CCD-shift Shake Reduction system developed by Pentax. While the net result is similar to the system used by Sony in its Alpha 100 D-SLR, it uses a series tiny electromagnets housed on a moving carriage that zaps the CCD around to compensate for user movement that could usually cause camera shake.
There’s Pentax’s latest SAFOX VIII, 11-point AF system in place with nine cross sensors offering the user full control over the AF points used. And it worked unerringly on my test with the continuous AF setting able to track moving objects within the frame while the shutter button is half pressed.
The cameras sensitivity range runs through ISO 200, 400, 800, and 1600 and up to ISO 3200, offering a broad range to play with. Interestingly, in the Auto mode you can get up to 3200 ISO, which is the highest Auto setting in its class at the time of writing. You can also pre-assign the range of ISO values available to the camera in Auto mode, allowing intuitive control of the system with increments of ISO 200 to 400, 200 to 800, 200 to 1600 and then ISO 200 to 3200. Pentax K100 D DSLR digital camera Review - Pocket-lint.co.uk