# Lens specifications
#### Optics
Image sensor | 1/2.8" Effective image area > 6.4mm |
Focal distance | 5±5% ~ 100±5%mm |
Aperture | f/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 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: 79.9mm
- Width: 46mm
- Height: 46mm
- Front end diameter: 41.8mm
|
#### 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 | -20°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
[![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)