The Leica ER series of riflescopes have been designed as a first chance for this famous optical manufacturer to enter into the world of shooting optics in the 21. Century and because of that we can write some superlatives about this Leica ER series. There is no point to praise the optical quality of Leica manufacturer, because there is hard to exceed their quality. As important as optical quality of these Leica ER series riflescopes to the designers, the robustness of construction and also the housing was very important also. The aim has been to create a superb robust housing but maintain the weight low and dimension small. Riflescopes from Leica ER series can also commend with the longest mounting length in their class and superb outer lens coatings for repulsionof water droplets as well as dust.