mounting binos onto an EQ mount is not a recommended startegy. the eq mount moves ep location, with binos uually you stay in one place & just move them up/down or across.
The two most common methods of mounting big binos is a p-mount(parallelogram) or photo tripod with video head. I personally prefer video head but both have adv/dis-adv.If going for a video head you will need an expensive one to cope with the weight, think manfrotto or similar (i think you would need to budget $200 for basic tripod/head & 400+ for much better fluid head/tripod
The big binos will give you really good views of dso's & the brighter/bigger galaxies..they are not really for planets - and the mag adv of your 5" would knock them away.
Using two eyes has an advantage though and the 100mm bins equate to apporx 141mm monocular scope
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