Regarding AFV recognition with tank sights:
finally tracked down this photo...as far as identification goes:
2008, Lebanese Border:From the sight of my Merkava Mk2b, At a range of roughly 2300 meters, these two UN white painted(!) Leclercs are not so easy to tell apart from any other western tank. BTW they were impossible to see on thermal, which I still cant explain to this day.
https://dl.dropboxusercontent.com/u/...0/SANY0168.jpg