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In this article I am going to explain about the two numbers often found printed on the body of a binocular and why understanding binocular numbers is important.
However and as you probably know, the pupils in your eyes expand in low light conditions, allowing them to take in more light. Their maximum diameter varies from person to person and with age, but in general, we take 7mm as being a good rule of thumb. Thus if you want a binocular with an excellent low light performance, you need a large exit pupil of around 7mm. To achieve this you either need extremely large lenses or a very low power, or a combination of both. So, for example, a popular low light binocular is a 7x50 and has a 7.1mm exit pupil (50÷7). In my article on How Different Configurations Affect a Binocular, I do go through the main points on a wide range of binocular sizes and thus it is well worth reading, especially if you are not entirely sure if a compact binocular is right for your needs. If you’re not too invested in observing the night sky, but want somewhat magnified views wherever you go, whether that’s of a bright night-sky object, a bird in a tree or a lion on a safari, then we wholeheartedly recommend this binocular — provided you stay out of torrential rain. If the Nikon Aculon T02 8x21 binocular isn't for you For more about the competing factors for choosing magnification are in this guide to How a Binoculars Magnification affects Stability, Field of View & Image Brightness. Objective lens sizePentax UD 9x21 If you're struggling to choose between the easier-to-hold 8x magnification or 10x magnification for closer views (especially noticeable on the moon and planets), then here's a compromise — 9x magnification, offering most of the benefits of both. ★★★½ The second number refers to lens size. A larger lens will make the image brighter and clearer, especially in low light, but will also make the binoculars bigger and heavier (and probably more expensive) There are many other factors that influence the suitability of binoculars for a particular intended use. How big is the eye relief? How large is the subject being observed? How far away will you be from the subject? What is the minimum focus distance? Summary
The centre focusing wheel was smooth and simple enough to use, as you would expect. They have comfortable rubber eyecups, which are not adjustable and you cannot fold down with 13mm eye relief, which cannot be described as long eye relief, but should be fine for most users. The exterior is made from a soft rubber armour, which is really comfortable to hold and should protect the binoculars from any small bumps and accidental drops as well as dirt and dust. I really liked the way the binoculars were really comfortable to hold up to they eyes, especially with one hand. Why Porro Prism These binoculars might not win any awards, but they offer excellent value for your money. You get impressive features for a budget-friendly price, and they come with a 12-month guarantee. You should consider the type of lens coating that is used. Lenses will be described as coated, multi-coated, or fully multi-coated. The best will be fully multi-coated with phase coating on the prisms. The best will also be nitrogen filled to eliminate the risk of internal fogging. Some compacts are waterproof or water-resistant, which is always a good idea for use in all weather and gives the user extra peace of mind. Which brand of binoculars are best?Whilst not always the case, the minimum focus distance tends to be closer on binoculars with lower magnifications.
This can get very technical and if you are interested, read BBR’s complete guide to the exit pupil.
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Like the magnification, the objective lens diameter makes a big difference to how a binocular performs and as a result which areas it is most suitable for use. Rubber-coated, non-slip, and water-resistant, these Pentax binoculars use an unusual reverse Porro prism construction. Most compact binoculars use a roof prism construction - whilst alternative, larger models usually use the Porro prism design. As the size of the objective lens increases, so does the field of view. As the magnification on a binocular increases the field of view decreases. So almost every 8x42 has a wider field of view than a 10x42. Just remember, other factors also affect the field of view, so two 10x42 from different manufacturers may have a different field of view.
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