i agree the 100mm BT's are too heavy for hiking - a spotting scope may be a good bet - a 100mm one if you need some aperture
i have an etx90 which a binoviewer can fit on alright.
garrett does sell a very nice 70mm bino telscope (about 83mm monocular view equivalent) you can push to about 40x. i had a chance to look rthru one while in the US & they were very nice
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