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Home / Products / Astronomy Mirror / D76F300 Astronomical Telescope Reflector
D76F300 Astronomical Telescope Reflector Objective Reflection Primary Mirror

D76F300 Astronomical Telescope Reflector Objective Reflection Primary Mirror

D76F300 is a Newtonian reflection primary mirror for astronomical telescopes with a 76 mm diameter and 300 mm focal length. It features a spherical surface coated with aluminum and protective foils, and is designed for use with a secondary mirror of 20 mm minor axis. The mirror has a surface accuracy of 1/6 wavelength.

  • 76 mm diameter and 300 mm focal length provide a balanced aperture for amateur and educational astronomy
  • Spherical surface simplifies fabrication and alignment for beginner to intermediate telescope builders
  • Aluminum coating with protective foils ensures high reflectivity and long-term durability
  • 1/6 wavelength surface accuracy supports clear image formation for visual and basic imaging use
  • Compatible with standard secondary mirrors (20 mm minor axis) in Newtonian telescope designs
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Technical features

  • Mirror type: spherical primary mirror for Newtonian reflector telescopes
  • Diameter: 76 mm
  • Focal length: 300 mm
  • Surface: aluminum coating with protective foils
  • Surface accuracy: 1/6 wavelength
  • Secondary mirror minor axis: 20 mm
  • Designed for use in standard Newtonian telescope configurations

Who it is for

  • Amateur astronomers building or upgrading Newtonian reflector telescopes
  • Educational labs teaching optics and telescope construction
  • Distributors sourcing replacement or component mirrors for telescope kits
  • DIY telescope builders requiring a ready-to-use primary mirror with known specs

Specifications

Mirror TypeSpherical Primary Mirror
Diameter76 mm
Focal Length300 mm
Surface CoatingAluminum with Protective Foils
Surface Accuracy1/6 Wavelength
Secondary Mirror Minor Axis20 mm

Use guide

  • Verify secondary mirror compatibility (20 mm minor axis) before assembly
  • Handle with care to avoid scratches or coating damage; use gloves during installation
  • Mount in a Newtonian telescope tube with proper collimation tools for optimal performance
  • Clean only with soft, lint-free cloth if needed; avoid direct contact with the coated surface

FAQ

What is the focal ratio of this mirror?
Focal ratio is F/3.9 (300 mm focal length / 76 mm diameter).
Is this mirror suitable for astrophotography?
It can be used for basic visual astronomy and simple imaging, but spherical aberration may limit performance for detailed astrophotography.
Can I use this mirror with a parabolic secondary?
No. The secondary mirror must be compatible with a spherical primary; standard Newtonian secondaries are designed for spherical mirrors.
What is the surface accuracy and how does it affect image quality?
1/6 wavelength accuracy means the surface deviation is within 1/6 of the light wavelength, suitable for visual use and basic imaging.
How should I handle the mirror to avoid damage?
Always wear gloves, avoid touching the coated surface, and store in a protective case to prevent scratches or contamination.

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