Here's what I'm starting to think: The magnification isn't what separates I.S. and regular binos. The difference really is in how they get used, strategically, to look for game. Basically, I.S. is fast but low-resolution and traditional is slow but high-res.
The I.S. binos have an advantage in quick scanning -- you can cover open country very quickly (and therefore more frequently over the same time period). Whereas, the traditional binos on a tripod are slow but way more comprehensive because they have more FoV, resolution, light gathering AND you tend to lock them down completely when glassing on a tripod.
Practically speaking, it might boil down to I.S. binos are better for finding animals in large, wide-open vistas and tripod glass is better for hidden or hard to see game.
And that may be because of the strengths and limitations of each. The I.S. binos we have in 2026 don't have the resolution*FoV of regular binos, but what they do have is quick, stable deployment. So what you end up doing is flitting between different areas of interest *faster* than you would on a tripod. Simply because it's easy. Which improves your chances of catching an animal out in the open when he stands up for a brief moment. Basically, you can increase your sampling rate by moving the glass faster. But the caveat is that it will be low-res samples, not high-res samples like with alpha glass on tripod. That's how I'm starting to wrap my head around this, practically.
So for example with I.S. binos you're not going to catch the "ear flick" of a buck in his bed but you probably have a better chance of catching the buck poking out over one of the *three* saddles across from you for his 30-second look-see between 7am - 9am. And that's because you end up flitting your attention around the basin more frequently with the I.S. -- it's like ADHD for glassing.
The other thing that seems very clear is the I.S. binos of today aren't very forgiving in less than ideal conditions. If the animals don't stand up, or don't "pop" against the background, or there's fog, smoke, glare, brush, burns, anything that obscures them at all... then I think you can leave the I.S. binos at home. At least for long-range glassing. Also dusk and dawn -- regular binos have this covered way better.
That's as far as I've got in trying to figure out how to utilize the I.S. binos, at least for my purposes.
