Before installing any protective equipment, it is absolutely forbidden to use a telescope to observe the sun, as it may cause irreversible damage to the human eye. The observation field of a telescope should be a complete circle, rather than the common 8-shaped circles with overlapping middle parts and separated sides in movies and television. This shape will only cause poor imaging and ultimately harm one's own eyes.
For the middle note telescope, the correct focusing method is to observe with the left eye first, and adjust the focus of the telescope at the same time. When the left eye scenery is completely clear, open the right eye and adjust the diopter of the right eye to adjust the scenery to the clearest. At this point, the scale of the right eye refractive power is the user's refractive power. You can record this scale and adjust the refractive power directly to that scale when using the telescope in the future. The refractive power of each telescope design has a certain range. If the user's refractive power exceeds this design range, they will not be able to adjust the scenery to the clearest when observing with the naked eye. When focusing with a binocular, first close either eye to make the scene clear, then adjust the focal length of the other eye until both eyes observe completely clearly. Telescopes are precision optical equipment, and regardless of whether they have waterproof and shockproof functions, they should be used with care, avoiding exposure to rain and snow weather as much as possible, and avoiding moisture and shock absorption as much as possible.
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