Easy to use and simple to manufacture.
It is suitable for observing the moon, planets and binary stars, especially for large-aperture telescopes.
The structure is small and does not require additional maintenance costs.
The closed lens barrel reduces the damage to the image quality caused by the air flow, and at the same time protects the optical lens.
Easy to carry, suitable for long-distance outdoor observation.
Can avoid secondary imaging, forming high-contrast image quality.
Through the achromatic design, the appearance of chromatic aberration can be well avoided.
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