What type, style, brand, size, etc. would people recommend if someone needed a pair of bins to use with one hand?
Are there bins where the IPD can be locked so they don't slip?
Thanks
I frequently use my Leica bins one-handed (because of dog on lead in other hand) - fine for a short time, but too heavy to keep steady for more than a minute at a time. Much would depend upon reasons and strength of the arm. I've seen a couple of Dutch birders who mount their bins on a flat piece of wood with a handle at 90 degrees in the middle of the base, but a second hand would be needed for focussing - the roof prism Leicas can be held and focussed with a one-handed grasp. Size of hand and length of fingers would be other considerations.
I think some Leupold Gold Ring bins have an IPD lock.
Vortex (not Eagle Optics as I first posted) make a little plastic thing that attches to the tripod adaptor bolt to lock the IPD.
I would think, in general, open bridge bins may give you the best opportunity for a solid one handed grip. A smaller, lower magnification bin might also help shake.