L3 Raytheon WT8070-021 lense LWIR with motorized focus

[figment]

Documenting this old LWIR lense with motorized focus here on EEVblog for all to share.

Markings on lens WT8070-021
Manufacturer Raytheon? L3 ?
Compatible camera models ? Unknown
Electrical for motorized focus is a very simple 2-wire direct to the DC motor (no visible markings on motor) simply apply DC power (voltage TBD) to drive the motor. Reversing the DC polarity will drive the motor in either direction to widen/narrow the lens field of view
Motor stops are built-in to automatically disengage the motor at maximum travel in both directions
Operational voltage range reported to be 4-6V DC

Objective diameter measures 76.6mm
output lens measures 34mm
Wavelength LWIR
Lens Coatings ?

An 86mm lens cap fits nicely on the objective https://www.amazon.com/dp/B0D8198TX6

[agate]

Control is 
bottom row middle pin - pin1.
pin2 - most left pin on a next row(4 pins).
You can use dc voltage 4-6V .
Change voltage polarity for opposite direction

[Fraser]

You will also likely find end stop detection switch contacts and a temperature sensor on that connector. The temperature sensor can be a simple thermistor or an IC based digital temperature sensor. I would think the thermistor is more likely in this lens.

Fraser

[agate]

HI Fraser,
This is not the case for this lens . I opened it - it has two wires only.

[Bill W]

HI Fraser,
This is not the case for this lens . I opened it - it has two wires only.

End stopped by limit switch and a diode - as bottom picture.
Switch breaks the motor power, diode allows it to move away from the limit only

[agate]

Yes end-switch with diode typically implemented inside lens