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Accordingly, Romania designed the PSL rifle as a substitute for the SVD Dragunov, and IOR was tasked with developing a scope for the rifle as a replacement for the Russian PSO-1. The result was the LPS 4x6° TIP2 telescopic sight, which became the standard Romanian sniper riflescope. The company is traded on the Bucharest Stock Exchange.
The windage adjustment is intended only for the initial sighting in procedure of the C79. Elevation adjustments are made via a rotary knob and are adjusted from 200 to 800 m. To bring the sight to a proper elevation zero, a small "gate" must be elevated which disconnects the elevation cam and one mil clicks can now be made.
The PSO-1 has neither a focus adjustment nor a parallax compensation control. Most modern military tactical scopes with lower power fixed magnification such as the ACOG, C79 optical sight or SUSAT (intended for rapid close-intermediate range shots rather than long-range sniping) lack such features as well. Modern fixed magnification military ...
With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage. The M16A2 later M16 series rifles have a dial adjustable range calibrated rear sight, and use an elevation adjustable front sight to "zero" the rifle at a given range. The rear sight is used for windage adjustment and to change the zero range.
The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
Parallax also affects optical instruments such as rifle scopes, binoculars, microscopes, and twin-lens reflex cameras that view objects from slightly different angles. Many animals, along with humans, have two eyes with overlapping visual fields that use parallax to gain depth perception ; this process is known as stereopsis .
A comparison of different reticles used in telescopic sights. The lower right represents a reticle found in the PSO-1 scope of a Russian SVD designated marksman rifle. Reticle of Bell & Howell Pocket Comparator Reticle accessory (PD-8) used in sniper rifles
If the rifleman wishes to adjust his rifle to strike a target at a distance instead of along an incline, he needs to adjust the bore angle of his rifle so that the bullet will strike the target at . This requires adjusting the rifle to a horizontal zero distance setting of R Z e r o = R H cos ( α ) {\displaystyle R_{Zero}=R_{H}\cos(\alpha )} .