Swarovski ME 1.7x Magnification Extender The BaK-4 roof prisms are

The BaK-4 roof prisms are both phase- and dielectric coated for increased contrast and light transmission along with their fully multi-coated lenses

The Silver Mirror coating gives a brilliant light transmission of up to 98%

objective lens cover

In order to free the maximum range of possible balance positions (140mm)

Swarovski ME 1.7x Magnification Extender The BaK-4 roof prisms areThe Swarovski ME 1. 7x Magnification Extender mounts between any ATX STX objective module and any ATX STX BTX ocular module and multiplies the standard magnification by 1. 7x. For example, with the 95mm objective and the ATX or STX zoom eyepiece, the ME 1. 7 increases the zoom range from 30 70x to 51 120x.