The field of view is from the manufacturer [1], there are a some specifications at the very end. That the three options are indicated by WFOV (Wide FOV), MFOV (

The field of view is from the manufacturer [1], there are a some specifications at the very end. That the three options are indicated by WFOV (Wide FOV), MFOV (Medium FOV) and NAR (Narrow FOV) I first found in a flight simulator documentation [2] and it matches what you actually see in videos. The zoom is on top of the selected field of view, with a zoom of 2.0 the field of view would shrink to 0.35° in NAR. There is one thing that I noticed in the flight simulator documentation, the field of views are given as 6°, 3°, and 1.5° while the manufacturer states 6°, 2.6°, and 0.7°. That seems a bit odd as they are seemingly trying to make a very realistic simulation and I don't understand why they would deviate from the real values here. In the end I decided to just stick with the value Raytheon gives without digging too much into this difference. The frame and object sizes in pixel are certainly correct, everyone can check this. The distance is also easy to read in the video and therefore certainly correct unless you want to argue that the distance measurement didn't work properly and reported a wrong value. Finally the field of view should also be certainly correct, only that the flight simulator documentation gives different values causes me a tiny bit of doubt. Further questions about the size? If not, what's next? Altitude, temperature, speed, wings, ...? Or does the size alone convince you that it is just a bird? [1] https://web.archive.org/web/20091211103559/http://www.raytheon.com:80/businesses/rtnwcm/groups/sas/documents/content/rtn_sas_ds_atflir.pdf https://web.archive.org/web/20091211103559/http://www.raythe... [2] https://forums.vrsimulations.com/support/index.php/A/G_Advanced_Targeting_FLIR_(ATFLIR) https://forums.vrsimulations.com/support/index.php/A/G_Advan...