Vortex Razor HD AMG | Optics Trade Debates
Hello and welcome to another one of our Optics Trade Debates. Today, we will talk about the top end riflescope series made by Vortex, the… Read More »Vortex Razor HD AMG | Optics Trade Debates
Maja
Vortex Razor HD Gen I Riflescope series | Optics Trade Debates
Hello. This is another episode of Optics Trade Debates where we will talk about the Razor HD series made by Vortex. The Gen II is… Read More »Vortex Razor HD Gen I Riflescope series | Optics Trade Debates
Leica Duovid binoculars | Optics Trade Debates
Welcome to Optics Trade Debates and today we are going to talk about a really special series of Leica binoculars, called Duovid, and we are… Read More »Leica Duovid binoculars | Optics Trade Debates
Vortex Raptor binoculars | Optics Trade Debates
Hello and welcome to another issue of Optics Trade Debates. Today, we are talking about another Vortex Binocular series – the Vortex Raptor. These are… Read More »Vortex Raptor binoculars | Optics Trade Debates
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