I use an old pair of Nikon 7x50's that I got at LL Bean about 20 years ago. That's about all the weight and power that the average person can hand-hold for extended periods. I'd love to have a pair of 100mm binoculars, but then one is committed to a rather heavy tripod and parallelogram-type mount. I think I'll probably invest in a binocular viewer for my refractor and duplicate one of my better Tele Vue oculars.

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The ether of general relativity therefore differs from that of classical mechanics or the special theory of relativity respectively, in so far as it is not 'absolute', but is determined in its locally variable properties by ponderable matter.

Albert Einstein, "On the Ether", 1924