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D130F650 Newton Reflection Primary Mirror for DIY Astronomical Telescope

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D150F750 Parabolic Reflector Spherical Primary Mirror for Astronomical Telescope

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D305F1200 305mm Telescope Main Mirror Parabolic Primary Mirror Large Diameter

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D203F1600 Newton Reflector Objective Primary Mirror Astronomical Telescope

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D203F750 Telescope Primary Mirror Objective Lens Group Focal Length 750mm

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D51F219 Diameter 51mm Refractive Green Film Telescope Achromatic Objective

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D76F300 Astronomical Telescope Reflector Objective Reflection Primary Mirror

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D76F700 Newton Reflector Objective Primary Mirror Astronomical Telescope

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Off-axis Guide Star Set 1.25-inch Double Helix Focusing Astronomy

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Fixed Diameter 50mm to 225mm Aluminum Alloy Solar Filter Sun Film

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M42/M48/M54 CAA 360 Degree Rotator Adjuster Modular Three-in-one

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M42/M48/M54 Focal Plane Ring Deep Space Photography Adjustment