Celestron 71454 Echelon 20x70 BaK-4 Prism Binoculars, Black

Product Information

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This will include those interested in plane spotting especially at higher altitudes where the high magnification is of course vital, but the reduced field of view is not as important as you can more easily follow the plane whilst holding them rather than them being mounted on a tripod. The official length of the 20x70 Echelon is 25.8cm (10.15in), which I measured and is correct (without the lens covers on, the eyecups out and the ocular lenses fully twisted in).Celestron’s large-aperture Echelon series binoculars were designed for use in low light conditions. Whether you are long-range glassing across a field or valley, or gazing at the splendors of the Milky Way, a pair of Celestron Echelon binoculars will get the job done. With an exit pupil of 3.5 mm, these binoculars deliver an amazing amount of light allowing you to see the most detail possible. These special coatings are added to the glass surfaces to increase transmittance levels, for a brighter image, but also improve the view by eliminating unwanted reflections that can cause undesired results.

The Celestron Echelon comes with rubber Roll-Up/Down eyecups. They are very large and have a 50mm diameter and because the rubber is quite soft, make for comfortable viewing. Access must be suitable for lorries which will be 3.5 tonne 7.5 tonne or 14 tonne lorries (7.5 tonne being similar to average refuse collection lorry) Also all the glass surfaces that the light bounces off within the porro prism reflect 100% of the light that hits them. This is also not the case with a roof prism and they once again require expensive highly reflective coatings to achieve the same transmission levels.

Even if you never take them outside, having a sealed and fogproof binocular is important. Firstly it is another indication of a bins class and secondly, remember that as well as liquid and moisture, it will prevent dust and other tiny particles from being able to get inside and potentially spoil the optics and your view.

These long range/astronomy binoculars are quite a bit bigger an heavier than your average general use or birding binocular and so having a case that is designed to be carried out in the field is actually not really needed. So it is fantastic to see that Celestron have included a very high quality hard case that offers the best protection possible for your optics. Typically, a larger field of view is considered better, especially in situations where objects are moving (like some objects in the night sky). Celestron Echelon binoculars are manufactured using quality Japanese optics and are assembled by hand by skilled technicians in Southern California. You could, for example, perform all of your measurements in inches or centimeters, calculate area in square inches or square centimeters then convert your final answer to the unit you need such as square feet or square meters. At 19.5mm, I would describe theses as having a really long eye-relief, making them an ideal choice should you wear glasses whilst using your binoculars.

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We strongly recommend that all Siberian Larch be pre-drilled and screwed through the face with two fixings across the face for all boards wider than 45mm. High grade Stainless steel screws should be used we recommend Spax façade screws in a minimum 45mm length Assume you have a rectangular area such as a room and, for example, you want to calculate the square footage area for flooring or carpet. Another quite important difference between these high end Celestron Echelon binoculars and the entry level Skymaster's is that the body on these has been fully sealed and they are described as being waterproof, whilst the Skymaster's are not.