Celestron 71198 Cometron 7x50 Porro Prism Binoculars, Black

Product Information

The larger the objective lens, the more light is gathered into the lenses, which results in a brighter image, which is especially good in low light conditions such as at dawn and dusk or cloudy days. Barium Crown glass, or BAK4, is the best type of porro prism optics. It transmits light better with less light being lost due to internal reflection because of a better manufacturing process and the high-density glass materials used. BAK7 is an inferior prism used by cheaper models that does not use high-density glass. What is a Reticle Rangefinder? allow for differences in eye focus. The binoculars have a large depth of field and are in focus from around 20m. The magnification and objective lens diameter are essential factors to consider when purchasing binoculars. As with the other binoculars mentioned above, these were popular with the testers for their light weight and compact size, although some found the compass hard to read and the damping not as effective as some of the others. The compass light is blue and gives out some flare into the field of view.

With its rings not resolvable on their own, Saturn was a challenge for this pair of binoculars. However, skywatchers will detect definite ansae, or the extension of the rings at either side of the planet, giving Saturn an oblate shape. While they do come with a higher price tag because of their exceptional optics and quality finish, we believe they provide excellent value for those who can afford them. This is a specification for the prism glass. BaK4 is superior to BaK7: it shows a truer round view, which translates to better light transmission and edge-to-edge sharpness. Testers’ comments were favourable regarding the compact size and light weight, but some had a little difficulty reading the compass – the blue compass light sent some flare into the field of view – and the damping was found to be less effective than some of the others. Celestron SkyMaster 8x56 binoculars: They're brilliant for astronomy, but also perform well across a wide range of observation environments such as looking for birds, other wildlife and spotting athletes at the sports game.★★★★A 7x binocular will be easier to hold steady than an 8x or 10x binocular which with increased magnification will also increase the shaking of hands when viewing through the lenses. The Celestron SkyMaster 25x100 binoculars are a worthy investment. Their tough, rugged, reliable build means you'll enjoy many years of stargazing, as shown in our full Celestron SkyMaster 25x100 review.

When comparing binoculars, the main consideration is their intended use. To understand which size better suits your needs, you’ll need to understand what the numbers in the binoculars’ description means. Vortex 10x50 Crossfire HD BinocularIf you want to move up to the next level with your binocular stargazing, then the roof prisms on these binoculars bring super-sharp views and come with a useful harness and an excellent padded case.★★★★ The view through the Vortex Crossfire HD 10x50 binoculars is sharp and clear, with stars appearing as perfect pinpoints of light. While observing brighter objects, you may notice some slight color distortion, but this is common for binoculars in this price range. Nevertheless, the Vortex Crossfire HD 10x50 offers an excellent balance of brightness and sharpness across the entire field of view. During our Vortex 10x50 Crossfire HD review, we only observed a tiny drop-off towards the very edges of the field of view. To work out height if you know distance: Object height in metres = distance in metres x scale reading/1,000 How we tested them A wide dome of starscape awaits you in the virtual image of that exit pupil, letting you or your child get that 'suspended in the sky' feeling.

The base model of the Steiner marine range is available with or without an analogue compass. The construction utilises a two-way valve technology that makes maintenance possible at any time, even after many years of use. Moreover, the tripod mount makes it easier to keep your optics in place while you are out hiking or bird watching. I will always consider these binoculars the best for first-timers because of their easy use and top-notch optics.

At 11-inches (280mm) in length and weighing 3 lbs (1.36kg), we found in our Celestron SkyMaster Pro 15x70 binocular review that they certainly have a lot of heft, but using them handheld isn't impossible. You'd be most comfortable if you mounted them to a tripod. However, because of their high magnification, the views of the moon are absolutely breathtaking. We were especially impressed by the stereoscopic viewing of the lunar surface. It is an optical rangefinder, meaning you need to know the size of the object to know its distance. Roughly speaking if you’re looking at a sailboat with a mast roughly 30 feet high, you can figure out how far away it is. Here’s how it works. What does FMC mean? In this case, the 10×50 will obviously make the image appear 10 times larger, rather than 7 times larger. The higher magnification power will offer more precise details of distant objects, but higher magnification means narrower field of view (the width of the area seen through the binoculars). The testers commented on the quality feel and optics of these binoculars. All found them good to grip, although they were on the heavy side for the girls. Others commented on the need to get the inter-pupillary distance just right to obtain a good image, and the necessity to keep them level for the compass to be in focus. However, the compass was well damped, although some found the light on the dim side. When using the Celestron TrailSeeker 8x42 binoculars, you'll notice minimal false color. False color, which appears as a purple or blue halo around bright objects (also known as chromatic aberration), was hardly noticed in our review, especially when we were looking at the lunar limb.The diameter of the pupil of the human eye is 3mm in the daytime and 7mm in the nighttime. As age increases, this diameter decreases. A person easily puts the eye at the place where maximum light is received; it is convenient with the help of a large exit pupil. Also, It is recommended to try out binoculars before buying them to ensure they feel well-balanced and have a pleasant field of view. Personal preference is crucial, and enjoying the gear is more important than the numbers. Binoculars can be adjusted for variations in the distance between different users’ pupils by rotating the lenses about a central hinge. Range is typically 50 to 70mm, and can be found on the hinge of some binoculars. First of all, let’s have a closer look at magnification. The Nikon aculon a211 binoculars have a magnification of 7x and an objective lens size of 50 millimeters. This is great because it gives you enough power to view objects far while still retaining clarity. And as far as the field of view goes, the magnification on these binoculars is definitely impressive. Optics

These binoculars are completely waterproof and fog-resistant due to their sealed design and nitrogen purging. You can use them with confidence in any weather conditions, whether indoors or outdoors, making them especially useful for stargazing. The prisms are of the Porro design preferred for astronomy. But they are cast of the slightly cheaper BK7 glass. All other binoculars we reviewed are BAK4. We saw the difference easily when comparing the exit pupil of the high-quality Oberwerk 8x40 (BAK4) to that produced by this Celestron 7x50. Instead of the sharply defined disc of light projected by the Oberwerks, the Cometrons yielded a fuzzy pseudo-circle, which hardened inward to a diamond-shaped (slightly stretched, rotated square) point on top. The exit pupil is the disc of virtual image at the binoculars' focus point. It’s the circle that you actually look into.) Celestron Cometron 7x50: Functionality If you need 7x50 Marine Binoculars with a reticle, compass, submersion protection, then Steiner makes the following models with those features and more: The TrailSeeker 8x42 from Celestron offers a slightly different view from the norm due to the amount of light their 42mm apertures collect. Their slightly lower magnification also gives you a wider field of view. The Earth's moon will appear slightly smaller when compared with 10x50 binoculars. But compared to other binoculars we've tested, this optical system and lens multi-coatings offer a sharper, brighter view.But I’ve experienced trying to use the PVS14 at sea, coming into a harbor in mild conditions. It seemed to illuminate POI and markings. Another option, which is cheaper is the Nightfall 4×50 by Firefield. These options have hands free head mounts. There’s not much zoom here though. New from Gael Force, these focus-free, waterproof BaK4 prism binoculars are buoyant and include an illuminated compass with distance calculator. They are identical to the Konus Tornado and Talamex Lankhorst Taselaar Deluxe binoculars, except for a different hand grip and colour, but are quite a bit cheaper. In the description of binoculars magnification is the first number. For example, 8×40, 8 is the magnification number. When seeing the object from a distant place, it magnifies the object eight times greater than the original one. Second Number Show: Object Lens Diameter