Since Overlord hasn't updated his blog since Dec 15 (apparently he's mad at the US players and all their QQing), here is a thread that he actually does update.  He posted a reply today even.

http://forum.worldoftanks.eu/index.php?/topic/703-eu-questions-answers/

I found this from a discussion on US forums about Optics and Binocs.  According to the wiki, they do not stack; according to Overload they do stack (http://forum.worldoftanks.eu/index.php?/topic/703-eu-questions-answers/page__view__findpost__p__1412985).

Penfold

Stacking binocs and optics isn't that great anyways, they only increase your viewrange to 500 meters max. Good job on tracking down Overlord.

Test