2022-06-10
Friends who observe carefully may find a layer of light color on the telescope, especially at an angle. Some are blue, some are green. So, have you ever thought that this layer of color would work?
The function of the lens film: The physical principle is to destroy the scene observed from the lens under the irradiation of direct light to form an unreal image. In order to improve the authenticity of vision, the surface of the eyepiece and objective lens is coated with polarizing film to improve the transmittance of light and reduce the reflection of light by the glasses, so that the observer can receive more light.
Color classification of glasses film: single-layer film and multi-layer film. In simpler rudimentary telescopes, a single layer of film only adds light once, and the more common are blue film telescopes. The multi-layer film can enhance the transmittance of light in multiple wavelength bands, which can well eliminate the chromatic aberration of scene magnification and improve the observation effect. Green film is a common multi-layer film. The more formal ones on the market are green film telescopes. Of course, red film is also called infrared film, but most of them are fake in the market.
What kind of film is the best for telescopes? Is the blue film or the green film good? This is our concern. From the introduction of the above classification, it can be seen that the green film lens is better than the red film. The red film is a monochromatic film, which will look very unnatural, and it is easy to feel uncomfortable after observation, resulting in eye fatigue. The technical difficulty of the green film is also higher than that of the red film. The green film can see the scene more comfortably, with a wider zona pellucida and a flatter field of view.
Novice friends can still choose a cheap blue film telescope when purchasing, because entry-level friends just use it to learn more about the use of telescopes and skills. The quality requirements of the mirror are not so high, and it is more affordable and cost-effective. Try it first, and then you will feel different when you get good quality. Friends who have higher requirements for telescopes can choose green film lenses or even larger lenses.
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