BF109 - Can't we just have the gunsight in the middle?

[LukeFF]

A long and good discussion on reflector sights:

http://forum.axishistory.com/viewtopic.php?t=17850

The basic principle of the reflector sight is as follows:

In the base of an upright tubular housing there is a light source. This is directed through an opaque glass plate on which is etched an aiming mark, or graticule. The image of the graticule is projected through the focal plane of a collimated lens, and reflected onto a glass screen mounted 45 degrees to the gunner's eye. This presents an aiming mark, usually a ring with a central dot on the reflector screen, giving the gunner a clear view of the target with the graticule pattern superimposed on it.