It isn't so much the scope as it is the crosshair. I could see the deer I shot at first light on an overcast day under thick canopy with my 2.5-8x36, but I couldn't see the standard Duplex unless I held it up to the sky. I ordered a 1.5-5x20 with the heavy Duplex reticle and what a difference in low light! It is no target reticle, but there is no missing it when you put the rifle up. Given that the 36mm objective is nearly twice the diameter of that 20mm it should be better in low light right? It isn't.
