Skip to content



The mounting surface on new Sauer 303 rifles (SUM)

SUM Mounting Solution on Sauer 303

BYDavid JerovšekMay 6, 2020

Let’s begin with the introduction of the J. P. Sauer and Sohn company, the oldest still-operating firearm manufacturer in Germany.…

The location of the erector spring on the IOR 4-28x50 riflescope

The Purpose of the Erector Tube and the…

BYStane BajukMar 18, 2020

Introduction All the contemporary riflescopes are equipped with an elevation turret and a windage turret. The former is used for…

Aluminium and steel Picatinny rails

Picatinny rail – Aluminium or Steel

BYDavid JerovšekJan 21, 2020

What is a Picatinny Rail? Let´s refresh our memory of what a Picatinny rail is. It is a mounting rail,…

Mounts with listed torque specifications

Screw Tightening Torque Values in Riflescope Mounting

BYStane BajukJan 15, 2020

Proper mounting of optics is one of the key factors that affect its precision and reliability. Each component, from the…

Rayleigh and Dawes resolution

Rayleigh and Dawes resolution

BYMaja PahičDec 20, 2019

Resolving power (or resolution) of an optical telescope is the ability to see small details in the image. It is…


Barlow lens

BYMaja PahičDec 10, 2019

Magnification of telescopes is calculated by dividing the objective focal length with the eyepiece focal length. To change the magnification,…

Aperture, focal length and focal ratio

Aperture, focal length and focal ratio

BYMaja PahičDec 10, 2019

Aperture One of the essential features of a telescope is its aperture. Depending on the type of telescope, the aperture…