Diameter 13mm Focal Length 49mm Astronomical Telescope Objective D13F49 Glued Blue Film Achromatic Lens K9

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Astronomical Telescope DIY Accessories Refraction Objective Lens HD Achromatic Diameter 57 Focal Length 540 Glued Blue Film

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Astronomical Telescope DIY Accessories Refraction Objective Lens HD Achromatic Diameter 52 Focal Length 684 Glued Green Film

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