Pentax Digital Camera Anthracite OPTIO S4i. Megapixel: 4 MP, Optical sensor size: 1/0.0984 mm (1/2.5 "), Sensor type: CCD. Optical zoom: 3 x, Digital zoom: 4 x, Focal length range (f-f): 5.8 - 17.4 mm. ISO sensitivity: ". Flash modes: Auto, Flash Off, Flash On, Red-eye reduction. Maximum video resolution: 320 x 240 pixels, Motion JPEG frame rate: 30 fps