Lens specifications Optics Image sensor Effective image area > 6.4mm Focal distance 4.7±5% ~ 47±5%mm Aperture f/1.6~f/2.5 Focus range WIDE: 1.0m - infinity TELE: 1.0m - infinity Field of view (D=6.6mm) WIDE: 71° TELE: 7.1° Distortion WIDE: -5.2% TELE: 1.8% Mechanics Mechanical back focus -0.33 (in glass t=0.4 BK7) Lens zoom structure The stepper motor is directly connected to the screw Lens focusing structure The stepper motor is directly connected to the screw Lens size Length: 59.6mm Width: 33.7m Height: 38.7mm Front end diameter:  34.8mm Motor specifications Screw pitch 0.4mm Spiral rotation direction Right Rated voltage 4.5-5.0 VDC Coil resistance 55Ω ± 10% Phase count 2 Step angle 18° / step Max start frequency 800 PPS/min @ at 5.0 VDC Max operating frequency 1200 PPS/min @ 5.0 VDC Pull torque 2.8 gf-cm min (at 480 PPS @ 5.0 VDC) Push torque 3.8 gf-cm min (at 480 PPS @ 5.0 VDC) Operating temperature range -10°C ~ +70°C Position alignment sensor PI Model number RPI-222 / ROHM IR switch Coil resistance 25 ± 5Ω Operation voltage 4.5V Current consumption 144~200mA Switching time 200-500ms Filters Clear glass 420 ~600nm Tavg >95% Zoom-Focus curve diagram