In addition to the size of the hunting binoculars, there are of course qualitative differences in the processing, the types of glass used or the optical coating, but also the choice of prisms for the effective light output, i.e. light transmission, of your hunting glasses.
High-quality, bright night hunting glasses are therefore usually equipped with larger but also more expensive Abbe-König roof prisms, while cheaper binoculars for hunting of the same size usually use the slightly weaker Schmidt-Pechan erecting prisms.
The 8x56 hunting binoculars by the Pirschler series are therefore only equipped with more powerful Abbe-König prisms. Since the exit pupil of the human eye, especially in older people, often no longer expands to the maximum of 7 mm, the exit pupil should also be taken into account when selecting hunting binoculars.