sights

Hello, I've been looking for any good books that cover the German "goodies" in detail and I was wondering if there were any favorites. By "goodies", I mean systems that are minor and not well known such as German gyroscopic sights (such as the EZ 42), proximity fuses (for rockets and shells)...

Does anyone happen to have the dimensions and weight of either / both of these sights? Thanks.

I am looking for images and references for any type of German aircraft sights preferably the EZ 42. Even images and references for German flak or tank sights will be appreciated too.