This is a quote from Kahles......
Kahles - A Synonym for Rifle Scopes
Since it is a fact that aiming over back and front sight produces a sharp image either of the target or of the aiming device but not of both, the first experiments directed to give hunters optical aiming aids go back to the early 17th century (target and aiming aid at the same level). Magnifying glasses and primitive predecessors of telescopic sights were attached to the weapons and even a kind of magnifying diopter was created. But all those attempts remained without success until around 1880, when August Fiedler (Stronsdorf), forestry commissioner of Prince Reuss, managed to build the first telescopic sight that really did work. Thereupon a number of constructions followed, among them some famous ones made by Kahles, an Austrian company located in Vienna.
One of these very early rifle scopes was sold under the fine- sounding name of "Telorar". It was manufactured by hand at the "Optical Manufactury" of a certain Karl Robert Kahles in 1898, and therefore we are completely justified in saying that Kahles is the world's oldest manufacturer of rifle scopes. It did not take long before the device became very well known among hunters everywhere and gained very best reputation.