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Military & Defense: Passively Athermalized FF Lens

October 10, 2012

As we mentioned in our last blog, Computer Optics is proud to have worked on and to continue working on custom products for a myriad of industries, and we are especially proud of the work done for military applications.

Last month, we presented you with a case study showing the work we did on a Compact IR Zoom Lens that needed to be resistant to very high shock and vibrations. This month we are excited to share with you another case study in which we manufactured a specialized passively athermalized FF lens.

Case Study 2: Passively Athermalized FF Lens


A military flight application requiring a fixed focus lens with no moving parts.


The desired lens must focus from a relatively-close 3 feet to infinity with no mechanical focus adjustment, while having a wide (+160°) field of view and athermal over a temperature range from 50°F to 122°F.


Durability: The lens had a very durable and ruggedized design.

Innovation: No motors, power, or moving parts are used with the lens; the system is completely passive.

Design: All materials used in the design have a normal coefficient of thermal expansion (CTE), but the design was able to accommodate in temperature shifts (both optically and mechanically). The lens stays in focus over the entire thermal range.

Compact: The finished lens measured only 2.5” Dia. X 2.2” Length.

Lightweight: The finished lens only weighed 12 ounces.

Production: IR Zoom now offers this lens as a standard, off-the-shelf solution (used with a Tau 640 camera).

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