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Porro Binoculars 20x80

Porro Binoculars 20x80

1. Ideal for bird hiking, watching, travelling, shooting and star gazing.
2. Large Bak-4 Roof Prisms and FMC 80mm large lens — ensures the key elements of an optical device, and make the image brighter and clearer.
3. Durable material of aluminum and rubber armor plus ergonomics protection to......
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Porro Binoculars 20x80:

1. Ideal for bird hiking, watching, travelling, shooting and star gazing.

2. Large Bak-4 Roof Prisms and FMC 80mm large lens — ensures the key elements of an optical device, and make the image brighter and clearer.

3. Durable material of aluminum and rubber armor plus ergonomics protection to ensure comfortable and safe use in the outdoor.

 

The specification of Porro Binoculars 20x80 as follows:

Item No.

20x80

Description

Porro Binoculars

Warranty

1 year

Power

20x

Obj. Lens Dia.

80

Type of Prism

BAK-4, Porro prism

Eyecups Type

Fold-down

Focus System

Individual focus

Nitrogen Filled

No

Water Proof

No

Lens Coating

FMC

Exit Pupil Diameter.

4.4mm

Exit Pupil Dist.

18mm

Min. Focal Length

32.4m

Angle

3.7°

Filed of View

195ft/1000 yds

Net Weight

77.6oz

The Product Size

9x4.7x12.8(in)

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Popularization:

Porro prism, also known as Pro prism, is a refractive prism used optically in optical instruments to modify the orientation of images.


it‘s a refractive prism used in optical instruments to modify the orientation of images. It was named after the inventor, Italian Optical Engineer Inacio Pro. The Paul prism is an isosceles right angle three prism made of glass blocks and ends at a right angle. In use, the light enters from the largest rectangular plane in the prism, passes through two total reflections of the inclined plane, and then penetrates the original incident plane. Because the light is in and out of the normal state, the three prism does not play the role of dispersion. But the image that passes through Paul's prism will be turned 180 degrees and will move in the direction it entered, that is, the direction of Paul's prism will also change 180 degrees. But because the image is reflected two times, the partial chirality is unchanged.

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