![]() Some manufacturers mention angle of view instead of field of view. The 8 power zoom makes them comparatively easy to hold still, important if you have a hard time keeping higher powered pairs steady. With your right eye closed, turn the focus knob until the image is clear. They are a solid pair of binoculars that is perfect for general purpose bird watching. Glass also partially reflects the light that hits it, although this can be compensated for with the right coating. This is done by bending the binocular at its hinge, changing the distance between the left and right ocular lenses until you see a single round image. This makes them ideal for terrestrial viewing, or for locating astronomical objects in. Most binoculars have glass lenses, which generally provide better image quality. Binoculars are designed to give a correctly oriented, right side up view. The higher the magnification the smaller is the exit pupil and vice versa. Evaluating a Pair of Binoculars 1 Choose glass lenses for better quality images. With a 7×35 binocular, for example, the object appears to be seven times closer than. Multi-coated = Multiple anti-reflection coatings on some lens elements = more light transmitted to you.įully multi-coated = Multiple anti-reflection coatings on all lens elements = ideal, more light transmitted to you.ĭielectric coating = maximises the quality of visible light and produces clear, high-contrast images, similar to those seen by the naked eye. Such binoculars normally have field of view between 5.8 degrees and up to 7. Magnification - Is simply the degree to which the object is enlarged. ![]() magnification - how to choose binoculars. Phase coating/correction (n/a for porro prism shapes) = Corrective contrast, brightness and sharpness/resolution.Īnti-reflection lens coatings = Fully coated, multi coated or both.Ĭoated = A single anti-reflection coating on some lens elements = enables more light to be transmitted to you than if there was no coating.įully coated = A single anti-reflection coating on all air to glass surfaces = better than a single coating. Magnification is the number of times an object is magnified through the binocular. Such treatments and coatings require expertise and quality control which is why RSPB works with Viking to produce quality optics, and also sell well-known brands such as Swarovski and Leica.ĮD lens/glass (Extra low dispersion glass) = Reduces colour fringing which can increase clarity and brightness quicker focusing. One of the reasons for this is that if there are any imperfections within the binocular, the higher magnification will only make those problems bigger (no pun. Some are better than others so it's important to try out the binoculars in person rather than base your decision around these factors. There are various treatments for the glass lens to improve image quality. ![]()
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