BaK-4 Prism Glass Glass – A definite improvement on the Celestron above is the fact that these have higher quality BaK-4 Porro prism glass. This gives you plenty of room to maneuver behind the ocular lenses to ensure that you can always get the full image without any black rings forming on the edges. Very Wide View – At 393 feet wide at 1000 yards away, these Fujinon Polaris binoculars have a viewing angle of 7. Each tester had their favourite, often influenced by the shape and size of the binoculars: a bit like shoe size. The Visionary StormForce-2 PF series are a range of traditional style porro prism binoculars featuring a high quality BAK4 Focus Free system combined with multicoated optics.

With the individual eyepiece focus, once set, you can see a sharp image for all relevant nautical distances. However, as well as these, the combination of a modest 7x power with the reasonably large, but not giant 50mm objectives is also one of the most frequently used setups for observing the night sky using binoculars. So with just your eyes, Andromeda looks like a dim, fuzzy star, but just by adding a pair of 7x50 binoculars, you can see a small elliptical cloud. They help us to identify popular products and understand your browsing habits so we can display relevant adverts to you. Ideal Binoculars for Astronomy - Award winning quality porro prism 7x50 binoculars offering an exceptional combination of optical performance, ergonomical design features and value.It's manufactured with a robust rubber armour body and offers a range of 367ft (132m) at 1000 yards. The problem here is that the magnification of the image also magnifies any movement, so the higher the power, the harder it is to keep the view still. Others commented on the need to get the inter-pupillary distance just right to obtain a good image, and the necessity to keep them level for the compass to be in focus.

Images of the Moon in both binoculars displayed excellent contrast and sharpness, and I could detect very little in the way of chromatic aberration in the centre of the field, with lunar craters peppering the southern highlands with impressive clarity. The more you pay for a pair of binoculars, the more technical information you’re likely to be given. When I first used them on my boat they acquired some salt spray, so I carefully rinsed them off in fresh water back at home.The exit pupil size is directly related to both the magnification and the size of the objective lenses.