Hello and welcome to yet another episode of Optics Trade Debates. Today, we are going to talk about the differences between Helion XP50 and Helion… Read More »Pulsar Helion XP50 VS Pulsar Helion 2 XP50 | Optics Trade Debates
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
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 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
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
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
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
A secondary mirror is a small mirror element in reflectors and catadioptric telescopes. It is used to bounce the light gathered by the primary mirror… Read More »Secondary mirror
A finderscope is a device found on top of a primary telescope. It is used for manually aiming the telescope to the desired celestial object.… Read More »Finderscope
Tracking is a phrase in astronomy, which means that a telescope sited on mount can follow the object as it moves on the night sky.… Read More »Tracking