I'm looking for a rangefinder that will double as a high quality monocular. I have very poor, non-correctable vision in my left eye so high quality binoculars are a waste. I would like to have a rangefinder that has very good optics, works well in poor light, and has a large field of view. I don't need to range stuff at 1500 yards, but I do need to accurately range deer in poor light out to 500. I tried the Leupold RXB-IV(See my earlier post) I use a Bushnell 500 now. It ranges well enough in good light, but optical performance in poor light is dismal. You can't range what you can't see. I have a 7-8 hundred dollar budget. I like your recommendations, bear in mind that monocular optical performance is paramount.