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

Product Information

They are pretty simple and don't have a loop or another way of keeping them attached to the binocular when not in use which is a little bit of a shame as after a time it does become somewhat painful having to find and replace them after every use. So what often happens is people eventually leave them off, which in turn means dust gathers on your lenses, which means more frequent cleaning is necessary and the potential to damage the lenses or coatings. The published width is 22.2cm (8.74in), this is with the hinge fully open (IPD set to max), this width can reduce to 20cm when you close the hinges (IPD set to minimum). These Celestron 20x70 Echelon binoculars have an angle of view that is advertised as being 3°, or to put it another way, the view you see is 52m wide at a distance of 1,000 meters away (157ft at 1,000 yards). Because you have to adjust each eyepiece separately, it does take a little longer to focus on closer objects than most "normal" binoculars that only require you to turn a single often centrally located focus wheel that adjusts the focus on both eyepieces simultaneously.

These are also not firm pillows. I switched out cotton filled pillows that had become a bit feeble with age and they had far better support. The memory foam core is impossible to feel in the centre. These pillows are, however, soft and comfortable. It takes just under 1 full rotation (360°) of the eyepiece to take the focus from infinity to it's minimum close focus of 328.1 ft. /100m. The turning mechanism for each eyepiece on my test pair was nice and smooth, but with some resistance that eliminates any unintentional turning. What is more, there was absolutely no free play or movement in either eyepiece which was great and shows just how well they are made. A slight difference to the norm is that rather than having a single wide central hinge, these Celestron Echelon binoculars have two thin arches that span the gap between the barrels, which I guess helps a little in reducing weight and because they are metal and not plastic like some I have seen, there is no compromise on strength.

One of the big improvements between this Echelon and the SkyMaster is the fact that these have Fully Multi-Coated optics, whilst the Sky Master's are only Multi-Coated.

Jury is still out for me on whether these actually live up to the temperature regulation claim. I'm not sure how effective the mesh parts are once a pillowcase is on and find polyester an odd choice for filling in an item that claims to prevent overheating. I'm a very hot sleeper (medication) and have still overheated since using these exclusively. Strong Points: The Celestron Echelon 20x70 binocular looks like it is, feels like it is and indeed is a high quality optical instrument made to very high standards using high quality components. You can use this guide to calculate the square footage and cost of a building, floor, walls, and more. The included instruction booklet is generic for the Echelon range and includes some brief information on the most important aspects of the bin like setting the focus and diopter, care and storage as well as cleaning in English, French, Spanish, German, and Italian. Keeping in mind that my 10x42 benchmark has an exit pupil of 4.2mm (42 ÷ 10) and these have a 3.5mm (70 ÷ 20) exit pupil, it is not surprising that even though it was quite difficult to tell because of the large magnification difference, I did think that my benchmarks were brighter in low light, but the difference was not huge and you do of course get a much more detailed image with these Echelon's.Celestron Echelon binoculars sport high quality 70 mm objective lenses made in Japan. Superior BaK-4 prisms were chosen for maximum contrast and sharpness, and all air-to-glass surfaces are multi-coated with Celestron’s proprietary XLT optical coatings—the same high transmission coatings used on our observatory-grade telescopes to increase contrast and resolution. These really are a great pair of long distance and astronomy binoculars. The higher price may put off many casual observers or those newer to the hobby but for those who are more serious and/or are looking for a great quality view then these really are hard to beat and a big improvement on their SkyMaster Series in my experience. The larger surface area of the lenses means they have the ability to capture more of the available light, but as you increase the magnification, the amount of light that gets through to your eyes decreases.

The ocular lenses are 25mm in diameter on these Celestron Echelon 20x70 binoculars which is pretty larger and as you may expect somewhat larger than those found on most standard sized bins in my experience. So for example, all 20x70 binoculars like these produce a shaft of light that is 3.5mm wide (70 ÷ 20 = 3.5) - this shaft of light that exits the ocular lens in known as the exit-pupil. Whilst Celestron are best known for their telescopes, they also produce a number of standard daytime and astronomy binoculars. Their very popular SkyMaster series is aimed at the more budget conscious user (for example see my review of the Celestron SkyMaster 25x70 Binoculars), whilst the Echelon series that are put together by hand in the USA using high end Japanese optics is focused more on quality: material quality, build quality and the image quality. On the exterior and under the carry handle is a cap that you can twist top open and thus equalize the internal pressure when transporting the binocular between places that have different altitudes.However apart from this, the porro prism does have a number of advantages. The first is that because the objectives are placed further apart, you get more of a stereo effect with a better perspective and sense of depth. When your size of your pupils are the same size or smaller than the exit pupil (In good light conditions), it is not a limiting factor. However when it gets darker and your pupils dilate, bins with smaller exit pupils will seem less bright than equal quality ones with larger shafts of light exiting them.

Typing out the words square feet is quite long winded and if you deal with square feet a lot you'll mostly see it written as either sq ft or ft 2.This pillow provides unparalleled breathability and support. A supportive foam centre lies within the heart of the pillow to offer optimum support. Specially designed to increase airflow and circulation, the Airmax pillow features an air mesh sidewall to help air to move freely around your head to prevent overheating and to keep you comfortable for a restful night’s sleep. Silentnight is the UK's number one sleep brand, with over 70 years of experience in creating products that offer solutions for every sleeper.