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Analysis on the repair method of surface precision in the processing of ultraviolet transparent optical lens

junio 23, 2021 por refractor

Optical lens processing is the main processing product of Evita, and one of the important applications is optical ultraviolet optical lens. As we all know, light ultraviolet rays are divided into near ultraviolet (UV-A, 320nm-400nm), ultraviolet (UV-B, 280nm-320nm) and ultraviolet […]

Some experience of adjusting the optical axis of the reentrant telescope

junio 9, 2021 por refractor

There are also two mirrors used, the first one is C8, Shika; the second one is the MEWLON210 on hand, Cassegrain. In spite of this, the adjustment of the optical axis of the catadioptric has been ineffective, and there is […]

Introduction to the history of the telescope

mayo 31, 2021 por refractor

A telescope is an optical instrument that uses concave and convex lenses to observe distant objects. The light passing through the lens is refracted or the light is reflected by the concave mirror to make it enter the small hole […]

Technology and Method of Astrophotography Picture Overlay

mayo 20, 2021 por refractor

In modern astrophotography, using a digital camera to take astronomical photos can take dozens of photos. Although each photo is exposed for only a few minutes and the captured image is underexposed, high-quality pictures can be obtained through computer software […]

Modern astrophotography can be roughly divided into nine steps

mayo 12, 2021 por refractor

1 good tripod A stable tripod is an extremely important tool for astrophotography. It can ensure that the camera remains absolutely stable and will not shake slightly during a long shooting time. 2 aim at the north celestial pole Aligning […]

What is the difference between the front objective lens and the side objective lens

marzo 18, 2021 por refractor

The disadvantage of the front sight of the objective lens is that it is not easy to protect. For example, when it is dropped, the objective lens is definitely the first to touch the ground first. Moreover, the sealing of […]

The advantages and disadvantages of the front and rear reticle of the scope

marzo 16, 2021 por refractor

The reticle of the scope mainly has two front and rear. The front is the reticle placed at the back of the objective lens group and also includes a field lens. The main thing is the embodiment of a situation […]

Beware of fake “infrared night vision telescopes”

marzo 11, 2021 por refractor

Nowadays, there are many red film binoculars with strong mirror reflection and shining light on the market. Some dealers call them “infrared”, “sub-infrared”, “ruby coating” and so on. They will also tell you that they are capable of “Infrared Night […]

How to choose binoculars

marzo 2, 2021 por refractor

There are a wide variety of binoculars on the market. Their appearance, size, price and purpose are different. Some are used for viewing scenery, sports competitions and theatrical performances, some are used for observing birds and other animals, and some […]

How far can the telescope see

febrero 26, 2021 por refractor

1. The distance seen by the telescope is related to human vision For example, the letters on the eye chart: when placed at a distance of 5 meters, people with good eyesight can see the bottom row, and people with […]