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The frame rate is a US government limitation. Turns out they get huffy if you start selling high-frame-rate (defined as >9fps?) LWIR cameras.

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Is that because it would ease creating all aspect heat seeking weapons?

Yes, and particularly because some of the, hmm, "good" players out there still haven't developed domestic capabilities. I'm talking about Russia.

This is the kind of stuff that should've been completely sanctioned for decades. It's just completely fucked up to find western IR sensors in guided ammunition used against civilians in Ukraine.

EDIT: details: https://infraredcameras.com/thermal-camera-export-restrictio...

ITAR, described in the link, is one thing. There is also the Wassenaar arrangement[1].

[1] https://en.m.wikipedia.org/wiki/Wassenaar_Arrangement

Doesn't Russia have the AA-11 (R-73)?

[edit]

Some brief research indicates that the AIM-9X and ASRAAM may both have wider off-boresight and IRCCM compared to the AA-11, with the IR sensor possibly contributing to this.

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