Is there on optimum size for binoculars for viewing of variable Stars? I have three pair of binoculars, 7X50, 15X60 and a pair of tripod mounted 11X70's. I ask this in anticipation of acquiring a universal binocular mount for my tripod, and possibly new bino's (Oberwerks 70mm /45 deg or Celestron 25X100). I might buy these new bino's regardless; they might all be suitable.
I would like to hear from some seasoned binocular observers on this matter