Khales have sacrificed very little ,if any,optical quality to accomodate the RF unit.Depth of view and clarity are excellent.It has two diopter rings for fine optical adjustment and the eye pieces have four settings for eye relief and spectacle wearers .RF menu is easily accessed with finger tip controls.A recess in the RF button makes it easy to find at dusk as the menu button is raised.Excellent buy.
Kahles Helia 10x42 Rangefinder: very sharp image, excellent rangefinder even in the darkness
Very sharp image even on the sides as well.
Minimal chromatic aberation on the sides, but it can be racognised focusing strongly on the side of the lens which is not the goal during normal use.
It works well in the dark despite of the 42 mm lenses.
The rangefinder is very fast below 1 km.
THE RANGE FINDER OPERATES IN THE DARKNESS, I COULD MEASEURE DISTANCE AT 700 M AT NIGHT OUT IN THE FIELD UNDER QUARTER MOON!!!
Very professional quality.