SUM Mounting Solution on Sauer 303
Let's begin with the introduction of the J. P. Sauer and Sohn company, the oldest still-operating firearm manufacturer in Germany. Their headquarters are in Isny… Read More »SUM Mounting Solution on Sauer 303
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Glossary
The Purpose of the Erector Tube and the Erector Spring in a Riflescope
Introduction All the contemporary riflescopes are equipped with an elevation turret and a windage turret. The former is used for a vertical adjustment of the… Read More »The Purpose of the Erector Tube and the Erector Spring in a Riflescope
Picatinny rail - Aluminium or Steel
What is a Picatinny Rail? Let´s refresh our memory of what a Picatinny rail is. It is a mounting rail, first manufactured in 1992 for… Read More »Picatinny rail - Aluminium or Steel
Screw Tightening Torque Values in Riflescope Mounting
Proper mounting of optics is one of the key factors that affect its precision and reliability. Each component, from the base, Picatinny/Weaver rails to the… Read More »Screw Tightening Torque Values in Riflescope Mounting
Rayleigh and Dawes resolution
Resolving power (or resolution) of an optical telescope is the ability to see small details in the image. It is an angular distance between two… Read More »Rayleigh and Dawes resolution
Barlow lens
Magnification of telescopes is calculated by dividing the objective focal length with the eyepiece focal length. To change the magnification, a different eyepiece must be… Read More »Barlow lens
Aperture, focal length and focal ratio
Aperture One of the essential features of a telescope is its aperture. Depending on the type of telescope, the aperture can be either a lens… Read More »Aperture, focal length and focal ratio
Lowest and highest useful magnification
Magnification is the ability of a telescope to magnify an object. A lot of observers, not only beginners, don't understand why higher magnification often doesn't… Read More »Lowest and highest useful magnification
Light gathering power
The light gathering power (also light grasp) is an ability of a telescope to collect more light than the human eye. It is expressed as… Read More »Light gathering power
Limiting magnitude - calculations
In astronomy, the magnitude refers to a logarithmic measure of the brightness of a celestial body. The larger the magnitude number, the fainter the object.… Read More »Limiting magnitude - calculations