10x42 roof prism binoculars, green
10x magnification 42 mm lenses Roof prism Field 102 m at 1,000 m Green
Full-size 8x42 binoculars with straight roof prism barrels and a large central focus wheel. Eight times magnification keeps the view wide and steady, and the 42 mm lenses keep it bright under trees and in the last light of the day.
Prices in GBP. We are not VAT registered, so no VAT is added. Free delivery.
An 8x42 is the size most birdwatchers reach for first. Eight times magnification brings a robin on a fence 40 metres away as close as if it were 5 metres away, yet the view stays wide enough to find a bird quickly and follow it as it flits through a hedge. Lower magnification also means your natural hand shake is magnified less, so the image looks calmer.
The 42 mm objective lenses give an exit pupil of 5.25 mm. In bright daylight your own pupil is only about 3 mm wide, so there is light to spare. When your pupils open up in dull weather, in woodland or at dusk, the larger beam keeps the image bright for longer than a compact pair. What the numbers on binoculars mean explains this in more detail.
This is a roof prism design: the light path is folded inside two straight barrels, which keeps the body slim enough to hold in one hand. Focus with the large central wheel between the barrels.
The supplier lists an eye relief of 18 mm and a body of 130 x 55 x 150 mm. The supplier sells the series as waterproof but gives no IP rating, and it does not state the prism glass or the lens coatings, so we do not claim them either. If you plan to be out in heavy rain a lot, our 12x50 binoculars with an IPX7 rating are the safer choice. Whatever pair you have, wipe it dry after a wet walk as described in Looking after binoculars in wet weather.
Open or close the hinge until you see a single round image instead of two overlapping circles. Then pick something about 20 metres away and turn the central wheel until it looks sharp. If one eye still sees a softer image, adjust the dioptre ring on the right eyepiece where fitted, then leave it there.
Not sure between this pair and the 10x version? Best binocular magnification for bird watching compares 8x and 10x in real birding situations.
| Magnification | 8x |
|---|---|
| Objective lens | 42 mm |
| Exit pupil | 5.25 mm (42 / 8) |
| Eye relief | 18 mm (supplier figure) |
| Prism type | Roof prism |
| Focus | Central focus wheel |
| Colour | Black |
| Dimensions | 130 x 55 x 150 mm |
| Weight | 820 g packed (supplier figure) |
| SKU | BS-842-ROOF |
The supplier sells this series as waterproof but gives no IP rating, so we cannot tell you how much water it withstands. Use it in showers, keep it out of downpours where you can, and wipe it dry when you get home.
The supplier lists an eye relief of 18 mm. Eye relief above about 16 mm is generally enough for glasses wearers. Keep the eyecups in their lowest position so your glasses can sit close to the eyepieces.
The supplier lists the binoculars only in the package contents, so please do not count on a case or a neck strap. Any standard binocular strap fits the strap lugs on the sides.
10x magnification 42 mm lenses Roof prism Field 102 m at 1,000 m Green
12x magnification 50 mm lenses IPX7 waterproof BaK-4 roof prism Close focus 2.5 m
10x magnification 50 mm lenses Porro prism Exit pupil 5 mm Green
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