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High-Transmittance 850nm Optical Glass Filter Lens - Narrowband Infrared for Cameras, Sensors-1pc(19x1mm)

1 x D40 Achromatic Objective Lens for DIY Refractive Astronomical Telescope -...

Neutral Density Optical Filter Sheet-12.5mm/25mm Diameter, 50x50mm Size, 0.1-1.0, H-K9L Float Glass.1pc(Round D12.5mm Density1)

Absorption-Type Neutral Density Optical Filter - 50x50mm Square Attenuation Sheet-1pc(0.3% Transmittance)

1pc D131F700 Double Separated Multi-Layer Green Film Objective - 131mm Caliber, 700mm Focal Length,

Absorption-Type Neutral Density Optical Filter - 50x50mm Square Attenuation Sheet-1pc(0.1% Transmittance)

1 Refractive Double Separation Blue Film Objective Lens for Telescopes - Caliber...

D106F900 Double Separated Blue/Green Film Lens for Astronomical Telescopes Diameter 106 mm,...

Circular Linear Polarizer - 12.7mm, 25.4mm, 50.8mm 400nm to 700nm Wavelength, 1000:1 Extinction Ratio-1pc(25.4mm)

1pc Short-Axis Secondary Mirror for DIY Reflecting Astronomical Telescopes - 20/25/35/40/70mm Options Available(45mm)

1pcs D70 70mm Blue Single Sided Double Separation Film Lens for Astronomical Telescopes (D70F700)

1 x 203mm Newtonian F800 Parabolic Reflector Mirror with 60mm Secondary Mirror(D203F800 Main Mirror)

1pc Short-Axis Secondary Mirror for DIY Reflecting Astronomical Telescopes - 20/25/35/40/70mm Options Available(28mm)

1pc D131F700 Double Separate Single-Layer Blue Film Lens for 131mm Astronomical Telescopes...

1 Piece 360 Degree Rotator Controller for Astronomical Telescopes - M42, M48,...

High-Transmittance 850nm Optical Glass Filter Lens - Narrowband Infrared for Cameras, Sensors-1pc(11x1mm)

1 x D60mm Glued Objective Lens - Achromatic with Blue Fused Coating...

1pc Short-Axis Secondary Mirror for DIY Reflecting Astronomical Telescopes - 20/25/35/40/70mm Options Available(50mm)

Neutral Density Optical Filter Sheet-12.5mm/25mm Diameter, 50x50mm Size, 0.1-1.0, H-K9L Float Glass.1pc(Square WxL50x50mm Density0.6)

1 x D40 Achromatic Objective Lens for DIY Refractive Astronomical Telescope -...

Primary Mirror Newtonian Parabolic Reflector with 35mm Secondary - Accessory for High...

Neutral Density Optical Filter Sheet-12.5mm/25mm Diameter, 50x50mm Size, 0.1-1.0, H-K9L Float Glass.1pc(Round D25mm Density0.5)

1 x D150F900 Reflector Astronomical Telescope Spherical Primary Mirror with 35 mm...

1 Piece Accessories for D150F1200 Reflective Astronomical Telescope: 150mm Primary Mirror and...

1 x 305mm Newtonian Parabolic Reflector Mirror with 80mm Secondary for DIY...

1 Piece D70mm Achromatic Objective Lens for DIY Astronomic Telescope - Focal...

1pc D114F450 Parabolic Reflector Lens - High Precision Primary and Secondary Mirror...

Light Filter for Black and White Photography - Optical Glass Color Correcting Filter, 1PCS(19mm)

1 D30mm Glued Objective Lens for DIY Telescopes: Achromatic with Blue, Red...

1pcs D70 70mm Blue Single Sided Double Separation Film Lens for Astronomical Telescopes (D70F900)