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Barr & Stroud ED PC 8x42 Series 4 Roof Prism Binocular is high-quality, high-precision binocular for the serious observer, the Series 4 ED binoculars from Barr & Stroud are their newest line as well as their top of the range. The ED in their name gives a hint to the main selling point of these Barr & Stroud binoculars and refers the use of Extra Low Dispersion glass lenses. This high-quality, high-precision lenses have less air bubbles and glass deformities in them that are more likely to cause image distortion. So basically the extra low dispersion glass prevents chromatic aberration because it concentrates and directs the wavelength of light more efficiently onto observer eyes.
The Barr & Stroud ED 8x42 Series 4 ED have superb quality BaK-4 roof prisms meaning that they are made of better-quality optical glass that will help in ensuring you get a high-contrast and sharp picture over the full field of view. These Barr & Stroud ED PC 8x42 Series 4 binoculars also have a set of phase correction coatings on the prism glass that keeps light in correct colour phases, yielding brighter images and higher edge-to-edge sharpness. The dimensions of the Barr & Stroud ED PC 8x42 are fairly standard for a full size roof prism binocular, but at 660g (23.3oz) they are one of the lightest full size binoculars.
The Barr & Stroud ED PC 8x42 Series 4 are O-ring Sealed and therefore fully waterproof and can endure complete immersion in water to a depth of 1.5 meters for three minutes and stay dry inside. They have also been "nitrogen purged", meaning that air inside the binocular has been replaced with nitrogen gas; this prevents the interior optical surfaces from fogging up due to rapid temperature changes or in areas that have high humidity. Focusing using the central wheel is smooth and very accurate using Barr & Stroud ED PC 8x42 Series 4 binocular and the dioptre adjustment is located on the right barrel of the binocular. It permits you to adjust the lenses separately to allow for differences in each of your eyes and plays an important part in accurately focusing your binocular.
|Brand||Barr & Stroud|
|Model||Series 4 ED 8x42|
|Series||Series 4 ED|
|Features||ED PC, 8x42, Roof Prism, Fully Multi Coated, BaK-4, Waterproof|
|Manufacturer Guarantee||10 Years|
|Lens Coating||Fully Multi-Coated|
|Optical Design||Roof/Dach prism|
|Objective Lens Diameter||42mm|