I’m not sure if the Trinovid has the greaseless focuser mechanism. Maybe some others can chime in on that, but certainly wants the temperatures drop in a few months you will find out. Either way it really doesn’t make a difference they’re all still usable in cold weather.I had no complaints about the focuser on my 7x42 HD+. It was nice and smooth and worked perfect in all temps.
The Trinovid HD focus is even smoother. It’s probably the best focuser I’ve used.
I haven’t used it in very cold temps yet. This winter I’ll see how it works.