LCD and Viewfinder
Sigma SD15 has a Fixed Type 3" LCD screen with a resolution of 460k dots. Both the screen size and the screen resolution is up to the standards of this class.
SD15 has a built-in Optical (pentaprism) viewfinder. The viewfinder has a coverage of 96% and a magnification ratio of 0.6x. 96% coverage means that what you see in your viewfinder while shooting will slightly be different from the actual image.
Max Shutter speed
Sigma SD15 can shoot continuously at max speed of 3 fps
and has max shutter speed of 1/4000 sec
SD15 has a built-in flash, and it also has a flash shoe to mount your external flashes too.
Sigma SD15 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations.
Unfortunately Sigma SD15 doesn't have Video recording ability.
Connectivity and Storage
You can connect SD15 to compatible devices via its HDMI port or USB 2.0 (480 Mbit/sec) port.
Sigma SD15 Features Compared to Main Competitors