Elkhornsun
Well-known member
I tried the Leica and Zeiss 20mm binos and they did not feel great and they were not as compact as the Swarvo 10x25 CL Mountain binos. It is not readily apparent how much more light can pass through larger objectives with greater surface area. A 25mm objective has a 56% greater surface area than a 20mm objective and that is a significant difference.