LCD and Viewfinder
Pentax K100D has a Fixed Type 2.5" LCD screen with a resolution of 210k dots. At only 2.5", the screen is on the smaller side and 210kdot resolution is lower than most of the recent models in this class.
K100D has a built-in Optical (pentamirror) viewfinder. The viewfinder has a coverage of 96% and a magnification ratio of 0.57x. 96% coverage means that what you see in your viewfinder while shooting will slightly be different from the actual image.
Max Shutter speed
Pentax K100D can shoot continuously at max speed of 3 fps
and has max shutter speed of 1/4000 sec
K100D has a built-in flash, and it also has a flash shoe to mount your external flashes too.
Pentax K100D features a Phase Detection autofocusing system. The AF system has 11 points to choose from.
Unfortunately Pentax K100D doesn't have Video recording ability.
Connectivity and Storage
Pentax K100D has a USB 2.0 (480 Mbit/sec) port to connect your camera to other devices.
Pentax K100D Features Compared to Main Competitors