sorry for the late reply, i can honestly say that i can’t see the huge difference between any of these optics as far as low light transmission. I do a lot of hunting and deer management on my farm, just this weekend i put those scopes to that test. Hunting over a 55 acre bean field let enough natural light come in to the scopes. Using a NX8 2.5-20 i would cut the magnification down to 15-18 and to get the performance from the PMII Ultra Bright i would have to drop from 16 to 14x to get equal or maybe a little more light. But the big price difference isn’t worth it to me. I also learned a valuable lesson, always set your zero stop! Missed a couple doe at 450 and 500 because i had dialed for a 700 yard shot yesterday morning and forgot to turn back! So when i added another 40 clicks i was up 130 for a shot at 450!