While the Geovid indeed uses a laser to calculate distance, it also factors in ballistic trajectory. For example, the actual distance to an object might differ with a bullet as opposed to a laser. If you were holding a gun instead of the Geovid, the binos will factor in a bullet’s drop to give you perhaps the most accurate information on our list up to 1200 yards.
Like every set of binoculars, astronomy binoculars will have two main features: magnification and the objective lens size. So for example, if the binoculars are 10×50 it means they have 10x magnification and 50mm objective lenses. The secret to choosing the perfect night time binoculars is getting the right balance between magnification and lens size that will result in a clear, bright and stable image.
High Reflectivity Coatings on the Prisms - If you plan on choosing a roof prism binocular then you need to look out for what (if any) coatings are on prism to increase light reflectivity. Roof prisms have a number of advantages over porro prisms, but it does have one surface that does not have total internal reflection. It is therefore very important for binoculars' optical performance to raise the reflectivity of this surface. Typically an aluminum mirror coating is used that has a reflectivity of 87% to 93% or a silver mirror coating (reflectivity of 95% to 98%) is used. This light transmission of the prism can be improved by using a dielectric coating rather than a metallic mirror coating. A well-designed dielectric coating can provide a reflectivity of more than 99% across the visible light spectrum. So firstly make sure at least aluminum mirror coatings are used and then depending on your budget you could choose to get higher quality silver or dielectric coatings. Roof prism binocular without high reflectivity coatings on the prisms should be avoided.
Here again Swarovski comes out on top with a close focus of 4.9 feet. I stand at 5'8", so functionally that means anything in front of my feet, be it a butterfly or another interesting insect, will be in focus. The Zeiss and Leica models are no slouches, both with a close focus of 6.2 feet, but the difference is very noticeable if you like to look at little critters.
Here the Leica bins have a slight edge. When comparing the 10x magnification models, Leica provides a 376-foot wide field of view at 1000 yards. The Swarovski bins are second with a 336-foot field of view, and Zeiss comes in last at 330 feet. If you opt for an 8x magnification model the Leica and Zeiss field of views increase to 443 and 408 feet, respectively. Swarovski does not make 8x bins, but the 8.5x version provides a field of view of 399 feet.
Pro Tip: Hunters, birders, and astronomers should keep the magnifications at 8x and below and boost the objectives up over 50mm to produce really wide exit pupils, such as this pair of 8x56 from Steiner. I used this specific pair in the middle of the night and they could completely cover my pupils, which boosted my ability to see, despite the dark surroundings. Boaters should also consider this type of configuration because the wide exit pupil will help to minimize the disorientation that is common when viewing through binoculars on pitching or rolling water.
The PowerView series offers the largest line of The PowerView series offers the largest line of Bushnell-quality affordable binoculars. These Powerview 10 x 42 Roof Prism Binoculars feature multi-coated optics for superior light transmission and high-magnification full-size viewing ideal for long-range observation. The nonslip rubber armor absorbs shock while providing a firm grip. More + Product Details Close
The binoculars are comfortable in hand with a fully rubber-coated exterior, which makes the entire piece waterproof. It offers adjustability for a short and long eye relief. They have multilayer-coated lenses and produce high-resolution imagery to say the least. The laser rangefinder gives an exact distance when in both horizontal distance or incline/decline mode.
So, you found the Andromeda galaxy (M31) with your 2-lb.,10x60 binoculars. Now you want to actually see it without all that zigzagging round, turning your stars into lightning bolts. And you also want to show it to your partner. Wouldn't it be nice to just park your binoculars in position on the sky? To do that, you need to be sure your binoculars have a screw mount point for a support system.