1P78 is a

telescopic sight A telescopic sight, commonly called a scope informally, is an optical sighting device based on a refracting telescope. It is equipped with some form of a referencing pattern – known as a ''reticle'' – mounted in a focally appropriate po ...

developed by and in use with the

Russian Armed Forces The Armed Forces of the Russian Federation (, ), commonly referred to as the Russian Armed Forces, are the military forces of Russia. In terms of active-duty personnel, they are the world's fifth-largest military force, with at least two m ...

, intended as a replacement for the older

PSO-1 Russian PSO-1M2 current military issue 4×24 telescopic sight View through a PSO-1 telescopic sight mounted on an SVD rifle The PSO-1 (''Прицел Снайперский Оптический, Pritsel Snaipersky Optichesky'', "Optical Sniper ...

and 1P29 scopes currently being used by the Russian military. The optic is intended to become the standard issue sight for the infantry riflemen in the Russian military.

Design

With a magnification of 2.8x, it is similar to the

Trijicon Trijicon, Inc. ( ) is an American manufacturing company based in Wixom, Michigan that designs and distributes sighting devices for firearms including pistols, rifles and shotguns. Trijicon specializes in self-luminous optics and night sights, m ...

ACOG series of optical gun sights, as well as other soviet designs like the PO 3.5x21P and 1P29. The 1P78-1 weighs 1.1lbs. Like many Russian sights, it has a rubber eye cup. The scope is illuminated by

tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus o ...

to aid in aiming and target acquisition in low light settings, and does not require batteries to illuminate the reticle.

Zeroing

The reticle consists of a series of chevrons, the topmost being zeroed at 400 meters, with each descending chevron indicating points of aim at 100 meter intervals beyond the main 400 meter zero. Inside the main chevron lies a dot that was implemented to be used against targets that are 500 meters from the operator; the second and third chevrons are for targets that are 600 and 700 meters away. While this scope does not have the range calculating system that the PSO implements, it is possible to use the dimensions of the hash marks to calculate range.

Mounting system

The 1P78 is mounted by means of the standard side rail found in other Soviet and Russian weapons designated with the -N suffix. The sight is centered over the bore of the weapon. It has an adjustable

lens A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements''), ...

cap that can rotate freely that incorporates a spring-loaded detent that keeps it from moving around. The use of the 1P78 blocks the iron sights of the weapon. The 1P78P variant can be mounted on a

Weaver rail A Weaver rail mount is a system to connect telescopic sights (often via a scope mount) and other accessories to firearms and certain crossbows. It uses a pair of parallel rails and several slots perpendicular to these rails. The later Picatinny ...

Specifications

Magnification Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in siz ...

: 2.8x *

Objective Objective may refer to: * Objective (optics), an element in a camera or microscope * ''The Objective'', a 2008 science fiction horror film * Objective pronoun, a personal pronoun that is used as a grammatical object * Objective Productions, a Brit ...

Diameter: 25 mm *

Weight In science and engineering, the weight of an object is the force acting on the object due to gravity. Some standard textbooks define weight as a Euclidean vector, vector quantity, the gravitational force acting on the object. Others define weigh ...

: 1.1 lbs

References

External links