Miniature high definition telescope.
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<br /> Ratio: 8 times.
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<br /> Caliber: 20mm.
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<br /> Prism system: Paul prism system.
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<br /> Lens: an optical lens.
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<br /> Optical coating: FMC full wideband green film.
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<br /> Eye mask type: cover the eye mask, suitable for myopia and non - myopia.
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<br /> Function: nitrogen filling waterproof