亚博2020

Optical knowledge base

1. How far can a telescope see?
From the optical principle, the telescope generally works from the nearest observation distance designed to infinity, that is, if your eyes are sensitive enough or the observation target is bright enough, you can always see any object from the nearest observation distance to the infinite distance. Unfortunately, this is not always the case. The objects you observe are not all as bright as the moon and other celestial bodies, and your eye sensitivity is limited, so you can only see things at a certain distance.
But different telescopes can see the distance is different, which is related to its optical performance. Telescopes with high field brightness (high transmittance) and high resolution can see farther distance.
So you need a telescope that can see farther. You should choose products with larger aperture and higher transmittance, and at the same time, you need good resolution.
 
2. What do signs like "7x50" on the binoculars mean?
"M" X "n" stands for "magnification" X "aperture". The meaning of "7x50" means that the magnification of the telescope is 7 times and the aperture of the objective lens is 50 mm.
 
3. Is the bigger the telescope, the better?
No, the larger the magnification, the larger the field of view, but it also means that the actual field of view will become smaller, that is to say, the light flux into the telescope will be reduced, that is to say, the target you see will become dim and blurred.
 
4. How to calculate the magnification of astronomical telescope?
Magnification of astronomical telescope = Focal length of primary mirror / The focal length of the eyepiece. The focal length of the primary mirror can be found on the mirror body. BOSMA The naming rule of products is series name + Primary mirror diameter / Primary focal length, such as "Explorer" 80/500 ”, if you use K9 Then the magnification of the telescope =500/9=55.6 Times.
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