[RightWhale]

How about this version?

Each lens of the 20X120 binoculars is almost 5 inches in diameter for good light-gathering. 20 power also means the field of view is somewhat limited compared to 7X50 binoculars, but still greater than most telescopes. Compared to ordinary 7 or 10 power binoculars [7X50 or 10X50,] the 20X120 binoculars have plenty of power and light-gathering ability; perfect for comet finding.

[LibWhacker]

Oh, lol, sorry. I misread it. BTW, go to google and search on 'comet hunting binoculars.' There is a whole bunch of stuff there on what the "pros" use (many do seem to use 25 x 150 binoculars to give them a leg up on their competition), when, where and how they go about hunting for comets, etc. One Japanese guy said he expects to make a discovery about once every ten years. A nice leisurely hobby.