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. The large 70mm objectives have the potential to capture plenty of light, which is complimented with the use of really high specification glass and coatings that results in a great quality image and excellent long distance, low light performance. The the foam inner is cut-out to fit the binoculars perfectly and once closed and sealed the case is also waterproof as it has a rubber O-ring around the lid, so not only are they protected from fairly large impacts, but also from dust and moisture as well. We manufacture picture frames in a wide range of colours, materials and finishes to suit every home.

Apart from the typically elongated barrels found on most on high powered binoculars, the overall shape is essentially the same as that of most porro prism bins with the eyecups being closer together than the objectives. Whilst this traditional body shape is necessary due to the design of the roof prisms and the way the light passes through them, it also happens to make for a fantastic ergonomic shape that feels very natural as well as comfy and secure to hold in your hands. If you measured in feet & inches, divide inches by 12 and add that to your feet measure to get total feet Siberian Larch is sourced from the Northern Europe and is Native to Western Russia. This specie is classed as a Softwood but has very good durability owing to its slow grown origins. It also has good strength against impact damage due to the compact nature of the grain. Siberian Larch is more prone to movement and twisting in comparison to Western Red Cedar so care must be taken to install correctly see below* Whilst I have already mentioned how well balanced the Celestron 20x70 Echelon binocular is and even with the high power and the fact that it is fairly heavy, it is still possible to use it very effectively with only your hands. However in some situations (like viewing up into the sky) or if you need to look through them for longer periods or if it is imperative that you have a very still image, you are going to want to attach this binocular to a tripod. BinocularSky....constructive criticism? I dont profess to being the authority on the subject. Forums are for gleaning other users, hands-on experience.

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As this type of observation is mostly based from a fixed point, transportability and ease of carrying are not the biggest concerns, which is a good thing because as you increase the size of the main objective lenses, the overall size and weight of the instrument obviously also increases. What this all means is that you will be able to observe more of the Night Sky (a larger area) at any one time with the 20x80s. Field of View

The `Visual Instruments` title at http://en.wikipedia.org/wiki/Exit_pupil for example, says exactly what I was trying to say, only in more detail. I didnt give wrong or misguided information! 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. 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.If you wanted a higher power than the 20x offered on these, but still similar low light capabilities, you could opt for a bin like the Zhumell Tachyon 25x100 or the Celestron SkyMaster 25x100 that produce 4mm exit pupils (100 ÷ 25 = 4). The trade off to this is of course a much bigger and heavier instrument that will most certainly require you to use a tripod most of the time. Prisms Not all binoculars are created equal, especially when they are expected to perform well in low light conditions. Observations during twilight and at night require larger optics to collect as much light as possible, but big lenses alone are not enough to ensure a superior viewing experience. It also takes quality glass and rugged construction to keep your binoculars safe and working well for years to come. Their iconic shape, with the ocular lenses closer together than their objectives, means that you can almost instantly tell that these Celestron Echelon binoculars have porro prisms inside of them. Because of their shape and they way that the light enters and exits these prisms, it usually means that they make for a less compact bin than those that use a roof prism where the light exits the prism in the sane line as it entered it. Its important to note that field of view usually decreases with higher magnification. This is why astronomers typically prefer higher fields of view, less magnification (e.g. the 20x80s are preferred). Xenoyia..... sorry for this in your post. If my advice is criticised in any way, right or wrong, i`ll respond and correct if necessary. But this is my view from experience, which is what your looking for. The text could have been added as a note, rather than pull me up? After all, were only trying to help you make a decision for yourself, we shouldnt be criticising.

With all that said about the quality of our picture framing services, you would expect our prices to be through the roof!

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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. Use this calculator to find the square footage, square inches, square yardage, square meters or acres for a building, home, garden or construction project. Calculate square footage, inches, yardage, meters and acres for landscape, flooring, carpet, or tiling projects to estimate area and the amount of material you will need. Also calculate the cost of materials when you enter the price per square foot, price per square inch, price per square yard or price per square meter. 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. 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.

So, ’20×80′ binoculars give you 20 times the magnification of the object viewed by the naked eye, and achieves this with front lenses that are 80 millimeters in diameter. 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.Unlike the cheaper Skymaster's where Celestron do not specify the main housing material, but which I presume to be polycarbonate, they proudly advertise that this 20x70 Celestron Echelon and indeed all the others in the series are made from aluminum. Whilst this material may not be as cheap or as lightweight as the polycarbonate ones, it is definitely stronger and most certainly contributes to the reassuringly solid and by and large feel of a quality instrument. When it comes to choosing a material, think about the purpose you want the picture frames to serve. If these are purely for decoration, then choose what suits your style. But if you want something that’s going to protect your artwork as well as look good, consider more durable options. All Echelon series bins, including this model use a individual focus system which essentially means that you need to focus each eyepiece individually by setting the diopter, which simply means turning the eyepiece. Not much to report here, other than to say that the colors look nice and natural and free of any artificial tinting that I sometimes witness, especially on cheaper optics. It is primarily measured in millimeters, by dividing the size of the objective lens by the magnification (80/20=4mm, 70/25=2.8 mm)