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

Biological Microscopes Lens 4X 10X 20X 40X 60X 100X(oil) 195 Achromatic Objective Lens

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1Pc Diameter 50Mm Focal Length 50 100 150 200 300mm Double Convex Glass Lens Primary School Science Junior Optical Experimen

Biological Microscopes Achromatic Objective Lens 4X 10X 20X 40X 60X 100X (oil) 195mm Conjugate Distance Universal RMS thread

Diameter 52mm Focal Length 200mm 500mm Doublet Glued Biconvex Objective Lens DIY Astronomic Telescope ED Green Film

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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

Diameter 12.7mm Focal Length 19mm 25mm 30mm 50mm 71mm 75mm Glued Lens K9 Optical Glass Microscope Lenses Telescope Accessories

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