Nikon Aculon A211 new series of binoculars for versatile nature applications, appreciated by birdwatchers and lovers of night sky observations. These binoculars are characterized by extremely reliable mechanical workmanship, solidity and "resistance to the user" and resistance to extreme weather conditions (they are sealed, "splash-proof"). At the same time, they offer impeccable optics, well corrected in terms of geometrical defects, aspherical, resulting in good flatness of the field. Appropriately large prisms and high quality MC layers are a guarantee of high optical efficiency, and as a result, brightness and resolution of the obtained images.
The model with smoothly variable magnification ranging from 8 to 18 times and a 42 mm objective lens diameter is a universal, relatively compact pair of binoculars with versatile nature and tourist applications.
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This device focuses a large amount of light. Looking directly at the Sun through this device may cause partial or complete loss of vision.
Question : What is the difference between Nikon Action / Action VII series binoculars and Nikon EX binoculars?
Answer: Nikon Action VII is a series of binoculars without waterproofing (it is splashproof, i.e. resistant to light rain and light wetting). The EX ( Extreme ) series is fully waterproof (up to 10 minutes to a depth of 1 meter), sealed with O-rings and filled with dry nitrogen inside to prevent internal fogging. Nikon EX binoculars are equipped with retractable eyecups, Nikon Action VII have fixed rubber eyecups.
In addition, the binoculars of both series differ in external tires. There are no major differences in the quality of the optics.
Question : What do the numbers 10x25 / 10x50 / 7x50 / 20x60 / 20x80 / 8-20x50 / 10-30x50 next to the name of the binoculars mean?
Answer: The first number in the 7x50 notation denotes the angular magnification (seven times), while the second - the diameter of the objective lenses expressed in millimeters. Notation such as 8-20x50 or 10-30x50 means that we are dealing with binoculars with a zoom, i.e. equipped with a system for smooth change of magnification, in this case from 8 to 20 times or from 10 to 30 times. 50 of course denotes the diameter of the objective lenses.
Question : Does the set include a case and a strap to hang the binoculars around your neck?
Answer: Yes, every binocular comes with a case and neck strap, and usually also with lens and eyepiece caps, unless it is specifically stated that it does not.
Question : What effect do the magnification and objective lens diameter have on the image of binoculars?
Answer: The higher the magnification , the greater the visibility of details, but also the lower the surface brightness of objects. Therefore, if we are looking for hunting binoculars, the magnification should be between 7 and 10x, for birds and landscapes we recommend binoculars with magnification between 7 and 12x, and for observing airplanes, we usually choose binoculars with high magnifications, in the order of 15-20x or binoculars with zoom.
In turn, the larger the objective lens diameter , the higher the resolution of the binoculars and the brighter the image, but also the greater the weight and size of the binoculars, sometimes requiring a photographic tripod.
Question : I still don't know which binoculars to choose, I want to buy universal binoculars with good parameters so that "you can see a lot". Which one to choose?
Answer: The most universal parameters of binoculars are 10x50 and we recommend them - they are characterized by good visibility and brightness at the same time, a large field of view and do not require a tripod.
Question : Should I choose fixed magnification binoculars or zoom binoculars?
Answer: Zoom binoculars are equipped with an additional optical system that allows you to change the magnification. In optics, "less is more" is often the case. Any additional optical system that does not correct one of the optical defects always has a negative impact on the image quality. It is like with photographic lenses - the most valued are those with a fixed focal length, not those with a variable focal length. On the other hand, zoom binoculars are more versatile, because nobody carries 2-3 binoculars with different magnifications.
Question : Do these binoculars have glass or plastic lenses?
Answer: All decent binoculars have all glass optics because only glass can be ground and polished into shape, whereas polymers ("plastics") are limited in accuracy by the accuracy of the molds.
Question : You write in the specification about anti-reflective/anti-glare layers, what is that? Are the anti-reflective layers there so that I am not visible, i.e. so that the binoculars do not give off "reflections" e.g. from the Sun?
Answer: Anti-reflective coatings, also called anti-reflective coatings, are used to increase the efficiency of an optical system, for example binoculars, but in principle any other device. Optical efficiency determines what percentage of the beam entering the optical system passes through the system. It is important to know that when light falls on the boundary of two optical media, e.g. glass / air, a certain fraction of the beam is reflected. From everyday experience, we know that you can see your reflection in a glass - for this very reason. In order to minimize losses, anti-reflective coatings are used, thanks to which more light passes through the boundary of the media and less is reflected.
Anti-reflective coatings can be of various types and classes, and they often determine the price of the best binoculars, whose total efficiency can reach up to 95%.
It is worth knowing that anti-reflective coatings are applied to the optical surfaces of microscopes, telescopes, spotting scopes, camera lenses or night vision devices for the same purpose as in the case of binoculars.
Question : In the descriptions of binoculars you write about prism glass, BK7 and BaK-4, what do you mean?
Answer: Most optical prisms are made from BK-7 (borosilicate) or BaK-4 (barium crown) glass. BAK-4 is a higher quality glass and produces brighter, sharper images. It is also a more expensive glass, usually used in higher-end binoculars. It is worth considering, especially if you are looking for binoculars for hunting and astronomy.
Question : I didn't find some parameters of binoculars in the description, which I found on other sites. Can I find out what brightness these binoculars have and what twilight efficiency they have?
Answer: For the sake of clarity, we usually do not provide secondary parameters that do not provide additional information than those provided. Nevertheless, these parameters can be calculated independently:
• exit pupil is the area in the eyepiece where the image is formed; the diameter of the exit pupil is equal to the ratio of the objective lens diameter to the magnification, e.g. for 7x50 binoculars it is 50/7 = 7mm, for 10x50 binoculars: 50/10 = 5mm, and for 20x60 binoculars: 60/20 = 3mm; this parameter is usually given in the description
• relative brightness is the square of the exit pupil (exit pupil: see above); for 10x50 binoculars the exit pupil is 5, so the brightness is 25, similarly for 7x50 binoculars the brightness is 50, for 20x60 binoculars the brightness is 9, etc.
• twilight efficiency ( twilight factor ) is another secondary parameter that night hunters like to pay attention to; it is equal to the square root of the product of magnification and lens diameter; with an ordinary calculator, we can quickly calculate this parameter:
- for 8x40 binoculars: 17.9
- for 7x50 binoculars: 18.7
- for 10x50 binoculars: 22.4
- for 20x60 binoculars: 24.5
Question : I am looking for binoculars for astronomy, which one should I choose?
Answer: There is no simple and short answer to this question. Astronomy binoculars are simply very good binoculars. This means very good correction of optical aberrations (mainly chromatic aberration and distortion at the edges) and high optical efficiency. For these reasons, we do not recommend zoom binoculars for astronomy, with perhaps a few exceptions. Astronomy binoculars do not have to have high magnification - that's what a telescope is for, to conduct observations at high magnifications. Binoculars - usually - should be handy, so that you can always take them with you when you can't take a telescope with you - then choose 7x50, 10x50 or 15x70 binoculars. Typically, large binoculars dedicated to astronomy, such as 20x80 and 22x100, constitute a separate class of optical instruments that require observation from a tripod.
For a beginner observer, astronomical binoculars are used to learn about the sky, the colors of the stars, and to find the brightest deep-sky objects. For an advanced observer, large binoculars are a very efficient device for observing comets, variable stars, nebulae, star clusters, and galaxies.
Question : I am looking for binoculars for a yacht / kayak trip / fishing / sea, which one should I choose?
Answer: Water binoculars must be waterproof, nitrogen-filled and should have 7x magnification, because only such magnification guarantees a bright and stable image.
Question : I am looking for binoculars for bird watching, should I get high magnification binoculars (16x, 20x or zoom binoculars)?
Answer: For birdwatching, we usually recommend binoculars with low or medium fixed magnification, i.e. from 7 to 12 times. The optimal set for a birdwatcher is a pair of fixed magnification binoculars and a spotting scope with a zoom on a photographic tripod.
