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Why is it that binoculars, spotting scopes, microscopes, telescopes… all need to be adjusted to be clear at any given distance and rifle scopes thankfully are clear from a few yards out to infinity? Are rifle scopes just a compromise lens wise that we can’t see with our normal vision?


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They make binoculars designed with the focus at a fixed distance. I have Minox's BD 7x28 IF.

I should probably use 'em more.

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Riflescopes often do have an adjustment. Many fixed are "fixed parallax scopes" that are set for 100-300 yards. If you pay attention, they aren't really that "focused" per se at all distances. It is still a compromise. The more magnification, the more you'll notice it.


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Bushnell used to make one of their mid-range binoculars that instead the usual wheel type dial it had a "wing" type dial, a short wing mounted on the where the adjustment wheel would normally be. You focused the adjustable eyepiece for around a 100 yards or so and then to see clearer at far or near distance all you did was press down on the left or right extension. It was a very fast focus system and people who used them really liked them, they were especially good for football game, baseball games, etc. with varying distances and lots of fast action.

I had a Leupold bino with individual focus eyepieces and they were very fast to use, I would adjust the focus for around 100 - 150 yards and items from close to far were in focus well enough be useable. If you wanted to have a clearer picture then you could fine tune them for distance but for general purpose they didn't need it.

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Steiner stuff was just about all focus free, for years. This is just me: With binocular vision, it’s hard to see ‘through’ foreground clutter without focusing the lenses beyond it. Monocular vision sees through easier for the single eye. I use Steiner stuff on the water or open fields, and my focusing stuff for picking apart woods.

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I once worked for a big gun dealer. You would not believe how many people had no clue that you have to adjust the eyepiece on a rifle scope. Guys would pick up cheap scopes and say, " wow that's more clear than those expensive scopes". I'd then show them how to focus the eyepiece lens.

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Originally Posted by JD45
I once worked for a big gun dealer. You would not believe how many people had no clue that you have to adjust the eyepiece on a rifle scope. Guys would pick up cheap scopes and say, " wow that's more clear than those expensive scopes". I'd then show them how to focus the eyepiece lens.

Never underestimate the stupidity of the average American consumer…..


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My eyes are not good at all. But with my cheaper Steiners they are like a 20 yr olds. There are some companies that do offer binos that are adjusted once, but require your eye to do a certain amount of focusing. As my eyes get worse my Steiners require more than an occasional adjustment. All my rifle scopes are adjusted to a point most people would find them usable as set .

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Drover, our 10x50 porro prism cabin binoculars have that wing type fast focus and I actually prefer it to the wheel focus on our other porro and roof prism binos. I suppose it was a patented idea from Bushnell, but one that I would have liked on higher end binos.


My other auto is a .45

The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory

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