Per the Infitac product page:
Detection range of 1100 yards = heat signature will appear as blobs and dots.
Recognition range of 165 yards = heat signatures will have good outlines to their shapes, some would say this is the max identification range.
Identification Range of 150 yards = specific features, clearer gradient details on heat signatures can be observed for confirming your target.
At 0.5x zoom, the field of view is 13.8°w × 10.3°h.
If your target is in the center of the screen at 100 yards, you’ll be able to see about 36ft (12yds) on each side of your target, and 27ft (9yds) above and below. (72ft total for horizontal view, 54ft total vertical view) ….
This is not meant for searching or scanning the countryside but I would say it still gives a decent “view” for anything inside of 125-ish yards when you’ve acquired your target.
The NETD rating is ≤20mK
Resolution, NETD (temperature sensitivity), and FOV