large gray telescope for watch celestial bodys mountainside background |
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| navigate by keyword : observing stars mount equipment science optical sun technology sky device detail fasteners gray telescope watch instrument land lunar planetary observation magnified magnify diameter monocular large celestial observe dioptric focus image tubular scope barlow astro achromatic universe object refractor sights objective outdoors infrastructure electronics professionalmagnify equatorial professional |
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| Optical instrument, telescope close-up with narrow depth of field. Outdoor astronomy, stargazing. |
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