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

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

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

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

360 Degree Rotation Controller for Astronomical Telescopes Compatible Accessories M42, M48 and M54(S8252 CAA)

D70 70mm Double Separation Single Sided Blue Film Telescope Lens with Retaining Ring(D70F360)

Achromatic Lens D40 for DIY Refractive Telescope Diameter 40 mm, Focal Length...

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

Gallium Arsenide Optical Lenses, Leaf Focusing Lenses for Strong Light Applications, Pack...

D60 mm Double Separated Multilayer Green Film Lens for DIY Refractor Astronomical Telescopes (D60F800)

Germanium lens with AR+DLC coating for Thermal Imager and Optical Applications -...

Germanium lens with AR+DLC coating for Thermal Imager and Optical Applications -...

Germanium lens with AR+DLC coating Imager thermometer viewing window Optical/Thermal 1 piece (35x2mm AR+DLC)

High-Transmittance 850nm Optical Glass Filter Lens - Visible Light Cut-Off, Narrowband for...

Secondary Mirror Short Axis for DIY Reflection Astronomical Telescopes (20-70mm Options Available)(38mm)

1 x D203F750 203mm Parabolic Newtonian Reflector Primary Mirror with 70mm Secondary...

D106F600 D106F900 Double Film Lens for Astronomical Telescopes - 106 mm Diameter...

Germanium lens with DLC coating for optical and thermal imaging - 1 Unit(30x2mm AR+DLC)

Germanium lens with DLC coating for optical and thermal imaging - 1 Unit(24x4mm AR+DLC)

Achromatic Lens D40 for DIY Refractive Telescope Diameter 40 mm, Focal Length...

Germanium Lens with AR+DLC Coating for Thermal Imager and Optical Applications - 1PCS(70x2mm AR+DLC)

Germanium lens with AR+DLC coating for thermal imaging cameras and optical applications...

90mm Double Separation Lens for Refractive Astronomical Telescopes - Multilayer Coating Available(D90F900...

1 x D131F1200 Double Blue Film Single Layer Lens for Astronomical Telescopes,...

60mm Refractive Astronomical Telescope Lens with Single Sided Blue Film for DIY Telescopes F300-F900mm(D60F900)

Newtonian Parabolic Reflector Primary Mirror Lens D160F800, Aperture 160mm, Focal Length 800mm.

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

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

D131F700 Separate Double Blue Single Layer Lenses for Astronomical Telescopes - 131mm...

Neutral Density Optical Filter Sheet - 12.5mm/25mm Diameter, H-K9L Glass, for Photographic...