Pretty much sums it up ...
Anyway - NETD for a FLIR Boson (.12u core) 40-60mk depending on the model, but typically its 50mk - NETD on a Tau2 (.17 core) 50mk - so oddly enough as technology improves you can have more resolution and retain the same sensitivity levels
Actually if anything reduces it the f1.2 lens will reduce the sensitivity a lot vs a f1
Lenses are normally matched vs the camera to the distance/FOV you want to see 320 or 640 models are available as well - so designers can select to what objectives they are looking for
In the past 320's used to mean .25 pixel pitch and 640 used be .17 - so larger imagers and more resolution, these days there are more options
Leaving the lenses aside the raw resolution of the pixels is better - so overall you will see more pixels per square inch which translates into better resolution apples for apples
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