DESCRIPTION

The 6X30 binocular is small and light so it is for who is on his long journey. The 6X30 binocular is designed to roof prism, in its left tube there is a range reticle. Being the 'clairvoyance' carried by Us special forces soldiers, the 6X30 binocular’s imaging is clear and sharp and its structure is light and solid. The 6X30 binocular lens barrel is full metal which ensure its strong and durable. And the rubber Wrapped outside can ease the impact. There are rubber patch on the its eyepiece, it is suitable for people with glasses. The 6X30 binocular is nitrogen filled, waterproof.

Item                                               6x30

Magnification                                 6x

Caliber(mm)                                  30

Field of View (ft/1000yads)       430

Eye Relief(mm)                            5

Exit Pupil (mm)                            23

Prism System                               Proof BAK4

Water Resistance                         Yes

Fog Resistance                             Yes

Weight (g)                                    710

What is Bak-4 prism

Most people is thinking BAK-4 is a name of material , in fact, BAK-4 is type of the glass.Standing for Baritleichkron which is a Barium Crown glass, BaK-4 prisms are in most cases considered superior to BK-7 prisms as they have a higher refractive index (1.569) and so has a lower critical angle. The result is that that less peripheral light is "lost" through the non-total internal reflection.

It has been pointed out to me that many profiteer's optical devices labeled as having BAK4 prism glass are not actually the same as the Schott BaK-4 ones. The profiteer's 
 BAK4 is not Barium Crown, but rather a phosphate crown and has a refractive index of 1.5525 and a dispersion of -0.0452 (Schott: -0.0523) and also has a higher permitted bubble count than Schott BaK-4 glass.