Binocular vision

I got some very nice new binoculars at Christmas, so various people have asked to try them; and it appears that if you give a pair of binoculars to someone who doesn’t use them much, the first thing they do is point them at the furthest object they can find. Or they ask ‘How far can you see with those things?’

Which is actually rather a bad way of testing them. Because if the visibility isn’t perfect — if there is any dust, or heat haze, or mist, or if it’s just a bit gloomy — you rapidly run up against the limitations of physics. It doesn’t matter how brilliant the lenses are, they aren’t going to magically make fog disappear.

The best way to get a sense of how good they are is to look at something close. You can appreciate the sharpness and brightness of the image much better if you look at a bird from thirty feet and can see every feather than if try to look at something half a mile away.

If I was more spiritually inclined, I’d be tempted to make a metaphor out of that — it’s not about seeing further than the other guy, it’s about seeing the things which are close to you more clearly — but I’m not, so I won’t.

» The photo was taken with my phone camera and the new binoculars. It doesn’t have much relevance other than that. I just like to have a picture to break up the rather austere design of the blog.

4 replies on “Binocular vision”

Simon Barnes has a great comment about binoculars – when asked to recommend some for first time birdwatchers, he says “any”. IMO, how far is less interesting than how close. I really love my “extremely close focussing” Pentax, which have a range of < half a metre.

Yes, close focussing is brilliant, for butterflies and flowers especially. Mine don’t go quite as close as that; I can’t quite focus on my own feet, but I’m not a tall man. So maybe six feet? Which usually good enough.

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