10x42 roof prism binoculars, green
10x magnification 42 mm lenses Roof prism Field 102 m at 1,000 m Green
Waterproof 12x50 binoculars with BaK-4 roof prisms, fully multi-coated lenses and an IPX7 rating (1 m for 30 minutes). Twelve times magnification and 50 mm lenses for long views over water, moorland and coast, with twist-up eyecups and a thread for a tripod adapter.
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Twelve times magnification is for distance: seals hauled out on a sandbank, a buzzard circling over the far side of a valley, ships on the horizon. The 50 mm objective lenses give an exit pupil of 4.2 mm, the same as a 10x42, so the extra power does not come at the cost of a dimmer view.
The binoculars carry an IPX7 rating. Under the IEC 60529 standard that means they have been tested for temporary immersion in water at a depth of 1 metre for 30 minutes. That makes heavy rain, spray and a drop into a puddle a non-event. It does not make them suitable for use under water.
The roof prisms are made from BaK-4 glass and the lenses are fully multi-coated, according to the supplier. BaK-4 has a higher refractive index than the cheaper BK-7, which helps keep the edges of the exit pupil round and bright.
Eye relief is 16 mm, and the twist-up eyecups let you set the right distance with or without glasses. The hinge adjusts from 61 to 74 mm between the eyepieces, and the right eyepiece has a dioptre adjustment of plus or minus 3 to balance the focus between your eyes. The close focus of 2.5 m means you can also look at a butterfly on a bramble or a bird on the feeder.
At 12x every movement of your hands shows. For a quick look, tuck your elbows into your chest or rest the binoculars on a wall or a fence post. For longer sessions, for example scanning an estuary or looking at the Moon, screw a binocular tripod adapter into the thread between the objective lenses and fit it to a tripod. The adapter is not included.
The binoculars weigh 1,046 g according to the supplier, more than a typical 8x42, so use the supplied wide neck strap. Read Best binocular magnification for bird watching to decide whether 12x suits the way you watch.
| Magnification | 12x |
|---|---|
| Objective lens | 50 mm |
| Exit pupil | 4.2 mm |
| Field of view | 88 m at 1,000 m (5 degrees) |
| Eye relief | 16 mm |
| Close focus | 2.5 m |
| Prism type | Roof prism, BaK-4 glass |
| Lens coatings | Fully multi-coated |
| Waterproofing | IPX7 (1 m for 30 minutes) |
| Eye spacing (IPD) | 61 to 74 mm |
| Dioptre | Right eyepiece, plus or minus 3 |
| Eyecups | Twist-up |
| Tripod | Adapter thread |
| Colour | Military green |
| Dimensions | 161 x 136 x 60 mm |
| Weight | 1,046 g (supplier figure) |
| SKU | BS-1250-IPX7 |
IPX7 is a rating under the IEC 60529 standard for temporary immersion in water at a depth of 1 metre for 30 minutes. Rain, spray and a short dunk are fine. The binoculars are not made for use under water.
They can be held by hand for short looks, especially if you brace your elbows. For long sessions a tripod with a binocular adapter gives a much calmer view. The adapter thread sits between the objective lenses; the adapter itself is not included.
Yes. The 50 mm lenses gather plenty of light for the Moon, bright star clusters and Jupiter. On a tripod the 12x magnification shows more than a 10x50 held by hand. See our guide Binoculars for stargazing.
Yes. The eye relief is 16 mm and the eyecups twist down, so your glasses can sit close to the eyepieces.
10x magnification 42 mm lenses Roof prism Field 102 m at 1,000 m Green
10x magnification 50 mm lenses Porro prism Exit pupil 5 mm Green
3x magnification 50 mm lenses 17 degree field For star fields About 400 g
8x magnification 42 mm lenses Roof prism Exit pupil 5.25 mm Black
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