I just got some 15×70 binoculars. Nominally for astronomy, I can see these being used for birding as well, mainly as an alternative to a spotting scope. The 70mm objectives will bring in a lot of light. For astronomy, I’ll use them with a parallelogram mount I built a couple years ago. For birding, with a conventional tripod. I arranged to have them delivered during Winter Storm Diego so that I can’t be blamed for the cloudy weather, it was already here.