# Lens specifications #### Optics
Image sensor1/2.8" Effective image area > 6.4mm
Focal distance5±5% ~ 100±5%mm
Aperturef/1.6~f/3.7
Focus range- WIDE: 1.0m - infinity - TELE: 1.0m - infinity
Field of view (D=6.0mm) - WIDE: 66.5° - TELE: 3.38°
Relative contrast - WIDE: >35% - TELE: >63%
Distortion - WIDE: -9.7% - TELE: 2.1%
#### Mechanics
Mechanical back focus-0.92 (in glass t=0.5 BK7)
Lens zoom structureThe stepper motor is directly connected to the screw
Lens focusing structureThe stepper motor is directly connected to the screw
Lens size- Length: 79.9mm - Width: 46mm - Height: 46mm - Front end diameter: 41.8mm
#### Motor specifications
Screw pitch0.4mm
Spiral rotation directionRight
Rated voltage4.5-5.0 VDC
Coil resistance55Ω ± 10%
Phase count2
Step angle18° / step
Max start frequency800 PPS/min @ at 5.0 VDC
Max operating frequency1200 PPS/min @ 5.0 VDC
Pull torque2.8 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-20°C ~ +70°C
#### Position alignment sensor PI
Model numberRPI-222 / ROHM
#### IR switch
Coil resistance25 ± 5Ω
Operation voltage4.5V
Current consumption144~200mA
Switching time200-500ms
Filters- Clear glass - 420 ~600nm Tavg >95%
#### Zoom-Focus curve diagram [![focus_chart_x20.png](https://wiki.kurokesu.com/uploads/images/gallery/2020-11/scaled-1680-/focus_chart_x20.png)](https://wiki.kurokesu.com/uploads/images/gallery/2020-11/focus_chart_x20.png)