31. Some of that light is reflected toward a digital imaging sensor that determines the fingerprint pattern. 32. The image sensor feeds the electronic viewfinder, and also records still images and video on command. 33. CMOS helmet cameras are based upon the complementary metal oxide semiconductor ( CMOS ) image sensor . 34. The PC-CMOS image sensor except the Nikon D90. 35. The flange of the mount defines the positioning of the lens relative to the image sensor . 36. Most of these image sensor formats approximate the 3 : 2 aspect ratio of 35 mm film. 37. The reset noise of capacitive sensors is often a limiting noise source, for example in image sensors . 38. Like professional models, it uses three CCD imaging sensors rather than one, providing for increased color fidelity. 39. HDR images can also be acquired using special image sensors , such as an oversampled binary image sensor. 40. HDR images can also be acquired using special image sensors, such as an oversampled binary image sensor .