Iris

DI-TT-4A on his dedicated tripod

The Iris are a little family of night vision scope's 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 have atleast 3 variant known so far who are all using gen 0 image intensifier tubes

The device is powered trought a removable power supply box plugged into the side of the scope and kept in place by metallic belt's,all variant's require a external power source to be connected to this power supply,these devices are originally assigned to ship's and used on said ship's or on land mounted on a tripod.

the device is supplied with a additional 24 volt's Heymann ES1 oscillator (navy version Iris 2x67 and Iris 4x100) or a 6 volt's oscillator (army version DI-TT-4A) , low voltage cable's for connecting to ship power supply (navy version) or to 6 volt's cadmium nickel batteries (army version), a 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.

Variant's:

Iris 2x67 Navy version who use the BA 56M 24 volt's power supply plugged against the scope and are fully painted in a light blue color, however at the begining all these device's had a more darker blue navy color that have been covered by the more light colored paint,the optic is a 67mm lense in a seemingly oversized body the reason being that all variant's use the same chassis.

Iris 4x100 a version of the iris scope with a bigger 100mm lense.

DI-TT-4A The army version using the same chassis than the others but here it use a 6 volt's power supply box and conected to a 6 volt battery by cable,this version is the main part of a whole set deployed by multiple crew's that include a 45 centimeter 24 volt's and 250 watt's IR searchlight, a box of batterie's and 2 tripod's

other detail's

its believed that all version's 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 cadridge's inserted in the scope and can be observed trought a round window , each of them's are maintained with 3 screw's each,the cadridge's themself's can be unscrew to be opened for removing the anti humidity sand who can be re used and re inserted in the cadridge after 5 hour's at 110 degree's celcius in the oven, the cadridge is dry when the sand is blue, if the sand is pink/sand colored then the cadridge is humid and need to be dried off by the manner described above

all version's do not have adjustable focus setting, the focus is set at 400 meter's for the army version of the scope

navy version collimator's use a german style reticle, unknown for the army version

Warning:

to the rare's owner's that might have the chance to have  the navy version's of these device's, due to their age its recommended to power these device's only with 12 volt's instead of 24 for avoiding risk's of overheating and dammaging the power supply box permanently.

External link:

http://roland.weber4.free.fr/