Barr & Stroud

Barr & Stroud Sierra 10x50 Binoculars

Code: 70176

Barr & Stroud Sierra 10x50 Binoculars

The new Barr & Stroud Sierra range of binoculars are a blend of superb optical quality and rugged refinement that has produced an elegant range of binoculars that take the Barr & Stroud brand to new level of performance and sophistication.


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OK you want the power of the 10x42 model and the light gathering ability of the 8x42 well you will find that, almost, in the Sierra 10x50 binocular. But as ever there is a trade off and this time it's extra size and weight. The extra 10mm diameter of the object lens results in a lot more glass being used and larger lens barrels to accommodate the lenses. If lightness and portability are high on your requirement list then I would look at either the 32mm or 42mm Sierras, but if you just want super bright powerful binoculars, that don't need you re-mortgage your house, look no further! 

The Sierra range from Barr & Stroud feature rugged construction combined with brilliant optics. They are waterproof to a depth 1.5m of water for three minutes, plenty of time to retrieve them if you have dropped them in a stream or puddle. This requires a high degree of mechanical quality in the construction of the binocular which is evident as soon as you pick the binocular up or use the super smooth focus control wheel. We don't expect that you will make a habit of dropping the binoculars into deep water but we do expect that you will want to use them in any weather the planet can throw at you, so you can feel assured that the Barr & Stroud Sierra can take it, again and again. This ability is further enhanced by the binoculars rubber armoured body which protects it from shocks and knocks. 

The binoculars are filled with nitrogen gas which keeps water out and also stops the optics suffering from internal fogging in adverse weather conditions, this binocular is truly weatherproof. 

Fully Multi Coated optics are standard features of the Barr & Stroud Sierra range as are BaK-4 phase coated prisms. This degree of sophistication ensures that as much light as possible is transmitted through the optics which results in a super bright contrast rich images of high colour fidelity for the user even in low light conditions where less expensive optics and coatings result in a dramatic loss of performance. 

For the comfort of the user the binoculars are supplied with metal twist up eyecups that are rubber coated which make them equally practical for people to use with or without spectacles. The rapid focus mechanism takes the user from close focus to infinity in less than one turn of the focus control knob, which ensures that you can follow the action however fast it is happening. 

The Sierra 10x50 are supplied with carrying case, rain guards, tethered lens caps, straps and lens cleaning cloth. 

Specification

Magnification

10x

Maximum magnification

Objective

50mm

Size of objective lens.

Close Focus

2.5m

Minimum distance that the binoculars will focus on

View 1000m

101m

Apparent view at 1000m

Weight

780g

Weight in grams

Glass

BaK-4

Type of glass used in construction

Exit pupil

5mm

Exit pupil in mm

Twilight rate

22.36

Light gathering ability

Brightness

25

Light transmission factor

Lens Coating FMC

Yes

Fully multicoated optics

Tripod Bush

Yes

Tripod bush for tripod/adapter

Dimensions

162x131x57mm

Binocular size in mm

Roof Prism Construction

Yes

Optical Type

Eye Relief

17.8mm

Eye relief in mm

Adjustable Eyecups

Yes

Twist up eyecups

Guarantee

10 Years

Length of manufactures guarantee

Diopter Compensation

+4/-4

Range of diopter compensation

Focusing System

Center

Type of focusing control

Interpupillary Distance

56mm~74mm

Range of eye adjustment in mm.

Waterproof

Yes

Immersion tested 1.5m for 3mins

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