Iris
The Iris is a little family of night vision scopes developed and produced in france by Optique et Précision Levallois (O.P.L.) in the 50's for the French navy and army.
The device has at least three variants known so far, all using Gen 0 image intensifier tubes.
It is powered by a removable power supply box plugged into the side of the scope and kept in place by metallic belts. All variants require an external power source to be connected to this power supply. These devices were originally assigned to and used on ships or on land, mounted on a tripod.
The device is supplied with an additional 24V Heymann ES1 oscillator (navy version Iris 2x67 and Iris 4x100) or a 6V oscillator (army version DI-TT-4A), low voltage cables for connecting to the ship's power supply (navy version) or to 6V cadmium nickel batteries (army version), an IR powered collimator who can be plugged into a secondary low voltage output and mounted in front of the scope and 6 spare small lightbulb's for the collimator.
Variants
Iris 2x67
Navy version which uses the BA 56M 24V power supply plugged into the scope. It is fully painted in a light blue color, however at the begining all these devices had a darker blue navy color that has been covered by the lighter colored paint. The optic is a 67mm lens in a seemingly oversized body, as all variants use the same chassis.
Iris 4x100
A version of the Iris scope with a bigger 100mm lens.
DI-TT-4A
The army version using the same chassis than the others, but here it uses a 6V power supply box and conected to a 6V battery by cable. This version is the main part of a whole set deployed by multiple crews that include a 45 centimeter 24V and 250W IR searchlight, a box of batteries and 2 tripods.
Other details
It is believed that all versions use the TV.1.A or TV.1.B image intensifier tube, however its only firmly confirmed for the army version.
All version's have two anti humidity cartridges inserted in the scope and can be observed trought a round window. Each of them are attached with three screws, the cadridges themself can be unscrewed to be opened for removing the anti humidity sand which can be reused and reinserted in the cartridge after 5 hours at 110°C in the oven, the cartridge is dry when the sand is blue, if the sand is pink/sand colored then the cartridge is humid and needs to be dried out by the manner described above.
All versions do not have any adjustable focus setting, the focus is fixed at 400 meters for the army version of the scope.
The navy version's collimators use a German style reticle, unknown for the army version.
Warning
For any fortunate owners of the navy version of the device, due to their age it is recommended to power these devices only with 12V instead of 24V to avoiding risks of overheating and damaging the power supply box permanently.
