Originally posted by TUXC
I have no idea if a German gyro gunsight ever saw combat.
This is from another forum:
"Develepment was ongoing from 1935, the first EZ 40 was presented summer 1941. Hahn also shows some hit % with the standard Revi 12 and EZ 40 sight. At the short, typical battle 25-50% increase was seen against fighters and bombers (it was more pronounced for the non-manouvering latter types), and more at very long ranges. This was understood for the Bf 109F's 2x7.92mm. However, it didn't change a few rules of thumb : effective fire can be only performed at short ranges, long range fire is ineffective with either gunsights.
The EZ 42 was quite successfull : "Reports of pilots showed, that individual attacks could be performed at 20 degrees of deflection. Despite the max. range of the EZ 42 was specified as ca 1000m, there were multiple Abschüsse from 1500 m engagement distance.
Hahn quotes an Allied report comparing the 'American Gyro-gunsight' and the EZ-42. The US version showed up 20% larger errors in the neccessary deflection angle, which already at low angles measured up to 1 degree error (...die selbst bei kleinen Winkeln noch bis zu 1* Fehler betragen haben.)
The EZ 42 was stabilised by two gyroscopes. Apprx. 800 were produced, from July 1944, most were however produced in 1945."