The camera is pretty small, that's one of the things I like about it, it's size. The Sony 100-400 lens is about the same size as the Canon 100-400L.
I also have the Sony a7rII with its full frame 42mp sensor. The a6500 has a 1.5 crop, 24mp sensor. Both of these mirrorless cameras can share the same batteries and lenses and one great feature for photographing the moon...or anything else for that matter is that since the viewfinder and LCD are both monitors, I can set it up so that as I change the aperture/shutter speed, the view will reflect the changes so I can see before I take the shot what it's going to look like. For manual focusing, they both can utilize magnify assist and edge detect(peaking).
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