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D30mm Glued Objective Lens-achromatic Telescoping Lens for DIY Astronomy Projects, Various Diameters...

Round PMMA Fresnel Lens 20-70mm Threaded Condenser for LED Light Projector VR Optical Experiments,1pcs(D50mmxFL50mm)

D150F750 Reflector Astronomical Telescope, Spherical Primary Mirror with 35mm Secondary Mirror, 1 Piece (D150F750+35mm)

D70mm Refractive Achromatic Objective Lens for DIY Astronomical Telescope - 400mm Focal...

100mm PMMA Fresnel Lens Solar Concentrator 3X Optical Focal Length 36-120mm(40mm)

Round PMMA Fresnel Lens 20-70mm Threaded Condenser for LED Light Projector VR Optical Experiments,1pcs(D50mmxFL28mm)

D150F750 Reflector Astronomical Telescope, Spherical Primary Mirror with 35 mm Secondary Mirror,...

1 cm-66 mm Flat Convex Acrylic Optical Lens for LED Flashlight with...

90mm Double Separation Lens for Refractive Astronomical Telescopes-Focal Length Options 500mm/650mm/1000mm (D90F900 Blue Film)

D60mm Bonded Objective Lens - Blue Coated Fused Achromatic 60F410 for Astronomical...

1 cm-66 mm Flat Convex Acrylic Optical Lens for LED Flashlight with...

Square Fresnel Lens 30x30 40x40 50x50 100x100mm PMMA Acrylic DIY Projector Condenser Magnifier(50x50mm-FL50mm)

Round Fresnel Lens PMMA Threaded Condenser 20-70mm for LED Light Projector VR Optics(D42mm-FL70mm)

50mm Round Fresnel Lens PMMA Focal 28-100mm for LED Solar Condenser Optics(40mm)

D30mm Glued Objective Lens - Achromatic Telescope for DIY Astronomy Projects, Multiple...

Round Fresnel Lens PMMA Threaded Condenser 20-70mm for LED Light Projector VR Optics(D50mm-FL40mm)

D30mm Glued Objective Lens-Achromatic Telescoping Lens for DIY Astronomy Projects, Various Diameters...

150mm PMMA Fresnel Lens Solar Focus with 3X Magnifier for DIY Projector(90mm)

1 x Acrylic Flat Convex Lens Diameter cm-50 mm for LED Flashlight...

D106 106mm Refracting Astronomical Telescope Lens, Multilayer Coating, 600mm/900mm Focal Length Options...

D70 70mm Double Separation Single Sided Blue Film Telescope Lens with Retaining Ring(D70F300)

D150F1200 Reflective Telescope Accessories - 150mm Primary Mirror & 35mm Secondary Mirror(35 Short-axis Mirror)

50-100mm Round PMMA Fresnel Lens Threaded Condenser for LED Light Projector VR Optical(D100mm-FL80mm)

Acrylic Flat Convex Lens with 20-66mm Rim for Flashlight LED Focus Torch...

50-100mm Round PMMA Fresnel Lens Threaded Condenser for LED Light Projector VR Optical(D100mm-FL100mm)

D70mm Refractive Achromatic Objective Lens for DIY Astronomical Telescope - 400mm Focal...

70mm PMMA Fresnel Lens Threaded Optical for LED Torch Lighting Focal Length 92%(40mm)

D60mm Glued Objective Lens - 60F410 Fused Blue Coated Achromatic for Astronomical...

Round PMMA Fresnel Lens 20-70mm Threaded Condenser for LED Light Projector VR Optical Experiments,1pcs(D70mmxFL30mm)

Short Axis Secondary Mirror for DIY Reflective Astronomical Telescopes - Options from...