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It must be because the lenses of my glasses are further from my eyeball than the ocular lenses of my old porros, and the air circulation around them probably better than the eyecups that help give those binoculars their immersive view, but I have no trouble with my glasses fogging up. My old...

One thing I'd want to check before buying any short eye relief binocular for a "no excuses" role (able to perform no matter what the weather and light conditions) would be whether the outer surfaces of the eyepiece lenses mist up in cold weather due to the proximity of your eyeball to the glass...

The biggest historic downsides to external focusing have been (1) making it fully waterproof, and (2) the bellows action of the external focuser pumping outside air into and out of the eyepieces, which over time can result in hazing. I question the actual need for a fully waterproof binocular...

Weatherproofing is part of that difference in price - which, if your username refers to the location in the Outer Hebrides, might be an ever so slightly relevant issue...