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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 […]

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 […]

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 […]

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 […]

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 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 […]

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 […]

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 […]

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 […]