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Zinc Selenide Focusing Lens (ZnSe) - 1 Optical Welding Machine Accessory, 99.8%...

High Precision K9 Optical Reflector Lens - Square/Round, Aluminium Coated, Pack of...

360 Degree Rotation Controller for Astronomical Telescopes Compatible Accessories M42, M48 and...

50x50mm Absorption Type Neutral Density Optical Filter - Glass Light Attenuation Sheet...

Germanium lens with DLC coating for optical and thermal imaging - 1...

High Precision K9 Optical Reflector Lens - Square/Round, Aluminium Coated, Pack of...

Zinc Selenide (ZnSe) Focusing Lens - 1 Piece Optical Welding Machine Accessories,...

Astronomical Reflector Telescope, Spherical Primary Mirror and 35mm Secondary - for Astronomy...

1 x D203F800 203mm Parabolic Newtonian Reflector Primary Mirror with 60mm Secondary...

Short axis secondary mirror for DIY reflection astronomical telescopes (20 to 70...

Short axis secondary mirror for DIY reflection astronomical telescopes (20 to 70...

Germanium Lens with AR+DLC Coating - Optical/Thermal Thermometer Observation Window 1 Unit(30x3mm AR+DLC)

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

Double Convex K9 Optical Glass Lens, Diameter 20-58mm, Focal Length 40-200mm(D30 F50 C5.2 E2.2)

DIY Astronomical Telescope Lens Set for 70 mm and 80 Telescopes Convexoconcave...

154 mm High Definition Dual Separation Lens for Refractive Astronomical Telescopes (D154F1200 Multilayer)

Germanium Lens with DLC Coating for Optical and Thermal Imaging - 1PCS(60x2mm AR+DLC)

Blue Fused 60F410 Coated Achromatic Lens D60mm for Astronomical Telescopes (D60F342 Film)

1 x 60mm D60mm Blue Fused Coated Achromatic Lens for Astronomical Telescopes...

Zinc Selenide (ZnSe) Focusing Lens - 1 Piece Optical Welding Machine Accessories,...

D60 mm Double Separated Multilayer Green Film Lens for DIY Refractor Astronomical Telescopes (D60F400)

Gallium Arsenide Optical Lenses Sheet Focusing for Strong Light Applications, 1PCS, Multiple...

Zinc Selenide (ZnSe) Focusing Lens - 1 Piece Optical Welding Machine Accessories,...

Secondary Mirror Short Axis for DIY Reflection Astronomical Telescopes (20-70mm Options Available)(40mm)

High-Precision K9 Optical Glass Reflector Lens - Square/Round, Aluminum Coated, 1 PCS...

Germanium Lens with AR+DLC Coating - Optical/Thermal Image Thermometer Observation Window 1...

DIY Astronomical Telescope Lens Set for 70 mm and 80 Telescopes Convexoconcave...

D30 mm Bonded Lens for DIY Telescopes Achromatic with Optional Diameters and...

Germanium lens with AR+DLC coating Imager thermometer viewing window Optical/Thermal 1 piece (50x3mm AR+DLC)

1 x 60mm D60mm Blue Fused Coated Achromatic Lens for Astronomical Telescopes...