The prisms have ‘floating’ mountings: they are fixed with a durable, flexible silicone material to protect the valuable optical components inside. The 7×50 model is well suited to marine use with exceptionally bright and stable images for on ship viewing. The convenient proportion between objective aperture and magnification makes observations during dawn phases possible. Porro prism binoculars (named after the Italian who invented them, Ignazio Porro) have two prisms which invert the image the right way up. Ideal Binoculars for Astronomy - Award winning quality porro prism 7x50 binoculars offering an exceptional combination of optical performance, ergonomical design features and value.

At home, I also like to use my 7x50 in combination with either a giant high powered binocular or my telescope that I have set up on the tripod next to me.Field flattener Lenses – the fact that Fujinon has incorporated field-flattener lenses into the Polaris series is a definite indication of their very high quality. It's manufactured with a robust rubber armour body and offers a range of 367ft (132m) at 1000 yards. 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. This is a critical performance factor, especially important for those wearing spectacles: the longer the distance, the better.

Distinguishing between the optical performances of the different binoculars is difficult and subjective. Indeed you don’t even need binoculars to do this as you can see the Andromeda galaxy M31 with the naked eye. Navigation Tools Dividers/ Compasses Celestial Navigation Nautical Slide Rules/ Plotting Aids Navigation Computer Navigation Kits Parallel Rules Plotting Tools RoadRule/ LightRule Sextants/ Scopes Writing Aids Imray Charts Magnetic Compasses C. Fully nitrogen gas filled waterproof, the model is protected from knocks and bumps with specially mounted prism assemblies, strong single die-cast aluminium bodies and durable thick rubber armouring. The other advantage of a 7x50 is that the combination of a very wide view and bright optics also makes a great low light general use, wildlife and particular bird watching binocular.By using optical BAK-4 glass and a multi-layer coating, these binoculars always provide a bright, high contrast image. The compact and handy bodies enable the BRESSER Hunter 7x50 Binoculars to be the perfect companion on just about any outdoor activity. mp Whether you're an avid birdwatcher, outdoor enthusiast, or just love exploring the details of the world around you, our discounted optics are your perfect companion. The fully coated optics guarantee a decisively higher light transmission through the glass, thus increasing color fidelity and contrast.

It is also a feature that many birders look for as it makes locating and then following fast moving birds at closer ranges much easier. Once the Zygo test report has been completed, the optical alignment is thoroughly tested and tuned to ensure they are spot on before they leave us. Fitted with BAK-4 prisms and a high refractive index multi-coating system for excellent clarity and contrast, this instrument offers excellent edge-to-edge definition and impressive colour fidelity. The 10 sets of binoculars tested use Porro prisms (see terminology panel, below) and, with one exception, are of the fixed-focus type which is typical for water-resistant marine binoculars. Given the abuse they will get on board, a remarkably cheap pair like this makes sense and represents excellent value.A 7x magnification binocular is considered the ideal marine or low light binocular, this size would be perfect as a gift when you’re unsure of what the binoculars would be used for.

The instrument is fitted with an illuminated compass with distance scale projected into the left hand eyepiece. 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. However, if you keep them at home, or safe and out of the rain and away from dust they will be fine.This means that it is probably only the outer objective and eyepiece lens surfaces that have been treated with an anti-reflection material. On passage, the ability to identify another vessel in the distance – in particular its direction – gives early peace of mind.