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50 51 52 53 57 58mm Telescope Cemented Doublet Lens Optical Achromatic Telescope Objective Lens Focal Length 182mm-987mm

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Diameter 19.5 26 31 31.4 34 36 38 40 42 44 52 60 63 75 100mm Glued Achromatic Lens DIY Telescope Objective Lens

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4X 10X 20X 40X 60X 100X Achromatic Objective Lens 195mm Conjugate Distance Tube Length 160mm Biological Microscope Objective Len