kaboku68 mentioned "less light gathering than full sized optics". I figured I would post some results of some of my binoculars on low light.
They are Alpen wings ED 8X20 pocket model (roof prism), Vortex Raptor 6.5X32 (porroprism), Bushnell Legend Ultra HD ED2 8X42 (roof prism), and Bushnell Legend Ultra HD ED2 8X42 (roof prism). The 8X20 and the 6.5X32 went down at the same time. I placed them on sand bags and pointed them at the very small deer antlers 131 yards from the porch. I discovered higher magnification allows one to see things longer lower magnification as light dissipates no matter how large the objective lens. The 7X35 lasted ten minutes longer and the 8X42 lasted an additional six minutes.
