Briefly analyze how astronomical telescopes can see the target clearly

1. Ensure that the light path is smooth;
A telescope is an instrument that collects light. Only when light enters our eyes through the telescope can we see the target clearly. Therefore, before using the telescope, we should first check whether the lens cap of the main mirror and the dust cover of the eyepiece have been removed. One way to test is to point the primary mirror at a bright light source and see if the eyepiece sees bright light. If you can see light, the light path is open.

2. Aim at the observation target; when viewing during the day, aim at a distant target, such as a distant mountain or building. Here's a reminder. Some users accidentally focus their telescopes on the sky above the skyline when looking into the future. At this time, there is a bright light in the eyepiece. No matter how you focus, you can't find the scene. When looking at the stars at night, aim for celestial bodies such as the moon. Starlight detector and starpoint pen as aiming aids

3. Telescope focusing;
What is focus? Talking about focusing means adjusting the focus during observation. Take our eyes for example. When we look at distant landscapes, we cannot see nearby objects, such as our own fingers. Conversely, when we stare at our fingers, distant views become blurred because our eyes automatically focus.

So how does a telescope focus? The telescope is focused by rotating the focus knob on the focus base. As we patiently turn the focus knob and look in the eyepiece, we will see changes in the sharpness of the object being observed. Continue turning the focus knob until a clear image appears. The focusing of the telescope is complete.

One more thing to say. Due to the high magnification of the telescope, the clear depth range of the scene will be much shallower than what our eyes see. As we observe, if we move the telescope to look at other objects, we may need to refocus. However, when observing stars, since all celestial bodies are far away from us, as long as one celestial body is in focus, it is almost unnecessary to refocus when observing other celestial bodies.

If we see the moon clear, after moving to Jupiter, we can basically see clear Jupiter out of focus. If you change other eyepieces to observe, you should also refocus. Let's say we first look at a target with a 20mm eyepiece and then look at the same target with a 10mm eyepiece, we need to refocus.

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