Faint fuzzies with a binoviewer????

As we all know Binoviewers split that most precious of comodities - extraterestial light - between both eyes. But while less light is presented to both eyes, our visual cortex does a better job of processing low contrast detail
when it comes from both eyes. In practice, however, I am curious how this plays out with very faint low contrast detail. Specifically, if someone is, say, just barely spotting the connecting bridge in M51 with direct vision in monocular mode how will they fare in biono mode? Thoughts...
Joe
15" Swayze

Hi Joe. I use a 20" dob and BV'er. On the showpieces, the binoviewer is stunning as it is on the moon and planets. The BV'er is killer on globs. On dim DSO's its a bit different. You are losing light but when you account for using two eyes, it aint much. Somewhere around half a magnitude I think. Stuff just visible in mono will be invisible in a BV'er. Its not much of a difference, but when you are hunting stuff at the limit of your scope it makes the difference between seeing and not seeing. Since you have a 15" scope I think you would be VERY pleased with a two eyed view on most objects.