To All,
While I'm FAR from an expert on telescopes & binoculars, one of our local TX Master Naturalists is a retired manufacturer's representative for a binocular company.
He said, during our TMN training course classwork, that the diameter of the forward lens should, if divided by the power, equal or exceed 5, to be "fully suitable" for birding, viewing team sports or hunting.
He further said, that he believed that 7x35, 7x50 or 8x40 binoculars were "the best all-around choice" for such activities.
yours, tex
