I remember when rangefinders came out and people thought them unsporting. Quite the contrary. Knowing the exact range to your target, especially live game, is essential if a shot is to be taken accurately at longer distances.
When they first appeared they were standalone units, so something else to carry. Enter the laser rangefinder (LRF) binoculars that combine both an essential observation tool with that of a precise distance finder with the laser rangefinding facility. Steiner has garnered a great reputation in recent years for its riflescopes and has an even longer pedigree for