It is more comfortable to view the stars while lying flat in a sleeping bag on the ground or sitting in a chair. When lying on the ground in winter, you can protect yourself from the cold by spreading cardboard or a thermal insulating sheet for camping on the ground, thus preventing the coldness of the ground from reaching you. If you have a reclining chair, you can view the stars in a more comfortable position.
Another feature we deemed essential was proper functioning for users with glasses. Your binoculars work only when the proper distance between your eye and the binoculars’ ocular lens (the lens on the eyepiece end) is maintained. Glasses would increase that distance if you didn’t have a way to adjust the inboard or outboard position of the ocular lens. This feature is called eye relief, and the standard recommendation is that those who wear glasses need a minimum of 15 mm of adjustability. Old-fashioned eye relief meant a pair of rubber cups that rolled down to bring your glasses to the proper distance; those cups are still found on some binoculars, but we don’t recommend them, because they’ll eventually stiffen or even tear. Preferable are eyepieces that twist downward into a more compact position, a feature that all of our picks have.
The down side to long eye relief is that it usually reduces the field of view. Some people wonder if you need to wear glasses at all using binoculars, well If you are near-sighted or far-sighted, you can use your binoculars without wearing glasses and the binoculars focus will compensate, but if you have astigmatism, you will need to use your glasses.
A constant question I am asked is, “What’s the difference between nitrogen and argon?” A quick Google search will return many links to forums where people have very strong opinions on the matter and will get into any number of online arguments over the subject. The short answer is that, performance-wise, there really isn’t much of a difference between the two for the clear majority of people. Both gases will keep moisture out and prevent internal fogging. If you do a deep-dive into the chemistry and look at a diagram of each molecule, you will see that argon molecules are larger than nitrogen molecules. Because of this, some manufacturers feel the larger argon molecules will have a harder time leaking out from the seals, keeping the inert gas inside longer and thus maintaining their water/fog-proof properties over a longer period of time. From a practical standpoint, as long as you have an optic with either of these inert dry gases versus having none, you’re ahead of the game.
Fantastic range is all I can say! I tested the one mile claim and found that these binos are capable of surpassing it. I ranged a high dirt bank in twilight conditions at 1780 yards! In normal daylight conditions, I was able to get 1600 yards with no problems, so the rangefinder is great. The glass in the binoculars isn't bad either. It's not as clear as say, a Swarovski, but at a third the price it's pretty good. It looked about as clear as my cousin's Leica 10x42, with only slightly less field of vision. I have been doing long range shooting and needed a long range rangefinder to replace my Leupold 1000 yard handheld. These are a little bulkier but having the glassing capability and great ranging aspect as well. All in all, worth the price unless you have to have the biggest and best. Which translates into very expensive.
While the Geovid indeed uses a laser to calculate distance, it also factors in ballistic trajectory. For example, the actual distance to an object might differ with a bullet as opposed to a laser. If you were holding a gun instead of the Geovid, the binos will factor in a bullet’s drop to give you perhaps the most accurate information on our list up to 1200 yards.
Also look for binoculars that have been either nitrogen or argon purged. This means all the internal air has been replaced with a dry gas which will protect them from any internal fogging. This fogging can occur when you get rapid temperature changes or in places that have high humidity levels. A secondary benefit of this is that it protects the inner workings from corrosion because there is no internal moisture. For more information read my article on waterproof and fogproof binoculars  

The terms “angle of view” and “field of view” are complementary. Both terms describe the amount of scenery, measured horizontally, that is visible when looking through a binocular. Imagine standing in the middle of a giant pizza pie; binoculars with a 6.3-degree angle of view would show the viewer a 6.3-degree “slice” of the 360-degree pie, looking outward.
One of the greatest advantages of binoculars comes from their very design. Unlike with a telescope, with binoculars you get to view space with two eyes. This is very important to give your brain the full visual experience. Not only does single-eye viewing severely hamper your depth perception, it also decreases your signal-to-noise ratio, which is not a good thing. When you have a high signal-to-noise ratio, your brain filters out much of the unwanted random impulses from each eye, leaving you with a better view of whatever objects you are looking at. In fact, many astronomers claim that color perception and contrast is improved by as much as 40 percent when using binoculars over a telescope.
At Optics4Birding, we’re serious about this hobby, and we’re committed to providing our customers with the best equipment at competitive prices. We’ve built our reputation on our outstanding customer service, and we stand behind every product we sell with a no-hassle return policy and easy online ordering options. We are happy to offer a rock-solid Price Guarantee to our customers, too: We will meet or beat any advertised price from an authorized dealer on the same item. And, most orders ship free!
Whilst both telescopes and astro binoculars are designed to give you a better view of the heavens at night, they both have their unique advantages and disadvantages and thus the best option will vary depending on your requirements at that moment. It is because of this, most people that a very interested in astronomy and practice it a lot, will posses at least one telescope AND a pair of bins.
The PowerView series offers the largest line of The PowerView series offers the largest line of Bushnell-quality affordable binoculars. These Powerview 10 x 42 Roof Prism Binoculars feature multi-coated optics for superior light transmission and high-magnification full-size viewing ideal for long-range observation. The nonslip rubber armor absorbs shock while providing a firm grip.  More + Product Details Close

The latest product from this direct-to-consumer optics brand is a big 15X configured for open-country hunters. The B.4’s lightweight polymer chassis makes it lighter than it looks, and a mid-frame ridge offers great purchase for those who hand-hold the binocular. While our test model was in plain black and gray, buyers can dress this optic up in their choice of camo patterns and colors for an additional fee. The optics were a little disappointing, and testers gave demerits for the boxy, overlarge eyecups. But the price is fair for a big, albeit niche, bino.


Uranus and Neptune. Some planets are squarely binocular and telescope targets. If you’re armed with a finder chart, two of them, Uranus and Neptune, are easy to spot in binoculars. Uranus might even look greenish, thanks to methane in the planet’s atmosphere. Once a year, Uranus is barely bright enough to glimpse with the unaided eye . . . use binoculars to find it first. Distant Neptune will always look like a star, even though it has an atmosphere practically identical to Uranus.
While I'm not familiar with a 60x60 binocular, I can extrapolate some issues you would have with it. First, your exit pupil will be just 1mm, which is prohibitively small - especially if you're observing in challening light like dawn or dusk, or trying to see into heavy brush. For reference, an average person's pupil is dilated to about 2-4mm in bright light, and 4-8mm in the dark. Additionally, your field of view will be quite narrow, so finding and tracking birds and wildlife will be tricky. Finally you will need a rock-solid support system as there is virtually no way to hold something of that magnification and size steady enough to enjoy the view.
They also have the added bonus in that they are far more versatile and you can use them for many other applications. If you plan to use this method, you should keep magnification below 12x in order to maintain steadiness. A good pair of binoculars with a magnification of 7x to 12x and a large objective lens will show you planets in our solar system, hundreds of star clusters, nebulae and even some galaxies.
This is a feature primarily for those who wear glasses. It means the distance from the surface of the eyepiece lens where you can still see the full field of view of the image you are looking at. It is difficult for many manufacturers to provide long eye relief and a wide field of view. However the Canon 10×30 IS Ultra-Compact Binoculars are a superb model that provides both for eyeglass wearers or even those who just want to be able to use their binoculars with sunglasses sometimes.

The magnification and objective of a binocular are always complimentary. The range of a rangefinder binocular also depends on these two aspects. You might have seen the binoculars being denoted by a set of numbers such as 7×20 or 10×42. What it denotes is the magnification and the diameter of the objective lens. For example, if the binocular is denoted by 7×20 it means that 7x is the magnification and 20 are the diameter of the objective lens. The magnification requirement depends on the purpose of your purchase. If you have bought it to take it to the movies, the ideal magnification would be anywhere from 3x to 5x. If the purpose something like sports, 7x would fair perfectly. But for hunting the best option would be 10x magnification. But one thing you have to keep in mind is that the field of view reduces with increase in magnification. The field of view of a 7x rangefinder binocular would be more than that of a binocular with 10x magnification. Also, it will be difficult to hold a rangefinder binocular which 10×42 for a long time as it will be heavy. The help of a tripod stand can be used in such cases.
Carl Zeiss lenses are made in Germany and are world-renowned for their clarity, quality, and optical capabilities. In terms of image quality, you cannot buy much better range-finding binoculars. Well balanced, waterproof, with superb optics and range finding ability, the Carl Zeiss Victory RF Binoculars make calculating distance a snap. They are all-around excellent, and we can recommend them without any reservation. This product is an absolute joy to use.
Depth of field: the depth of field is a term that describes the amount of a scene, from near to far, that appears sharp at any given point of focus. This factor is often overlooked, but a better depth of field means less “fiddling” with the focus wheel in use, and can make a huge difference to your experience when using binoculars in the field for extended periods.
True, the differences in data between your left and right eyes are integrated into depth information by your busy mind. Even though the vast distances of the universe make it challenging to perceive depth, if you inform yourself in advance with some knowledge about the objects you are going to be observing, you can begin to see the universe in 3D. Binoculars make this mental gymnastics faster and easier.
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