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131mm Large Optical Dual Separation Doublet Lens Focal Length 1200 700mm DIY Refractor Telescope Objective Achromatic Lenses, Find Details and Price about 131mm Large Optical Dual Separation Doublet Lens Optical Components from 131mm Large Optical Dual Separation Doublet Lens Focal Length 1200 700mm DIY Refractor Telescope Objective Achromatic Lenses - SiChuan JUKA Optical Technology