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D127F900 Newton Reflection Primary Mirror for DIY Astronomical Telescope

D127F900 Newton Reflection Primary Mirror for DIY Astronomical Telescope

D127F900 is a Newton reflection primary mirror for DIY astronomical telescopes with a 127mm caliber and 900mm focal length. The mirror is spherical, aluminized, and features a protective film. It is designed for use with an elliptical plane secondary mirror (minor axis 35mm) in Newtonian telescope configurations.

  • 127mm aperture provides sufficient light gathering for deep-sky and planetary observation
  • 900mm focal length offers a balanced focal ratio suitable for both wide-field and high-magnification views
  • Spherical primary mirror simplifies fabrication and alignment for amateur telescope makers
  • Aluminized surface with protective film ensures high reflectivity and long-term durability
  • Compatible with standard Newtonian telescope designs using a 35mm minor axis elliptical secondary mirror
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Technical features

  • Caliber: 127mm
  • Focal length: 900mm
  • Primary mirror type: Spherical
  • Surface coating: Aluminized with protective film
  • Secondary mirror type: Elliptical plane
  • Secondary mirror minor axis: 35mm
  • Designed for Newtonian reflector telescope systems
  • Suitable for visual observation and basic astrophotography

Who it is for

  • Amateur astronomers building their own telescopes
  • Educational institutions teaching optics and telescope mechanics
  • DIY electronics and maker communities integrating optical systems

Specifications

Caliber127mm
Focal Length900mm
Primary Mirror TypeSpherical
CoatingAluminized with protective film
Secondary Mirror TypeElliptical plane
Secondary Mirror Minor Axis35mm

Use guide

  • Use with a 35mm minor axis elliptical secondary mirror in a Newtonian configuration
  • Ensure proper collimation during telescope assembly
  • Handle with care to avoid coating damage; clean only with approved optical cleaning methods

FAQ

What is the focal ratio of this mirror?
F900 / 127mm = f/7.1, a balanced ratio for visual and imaging use.
Is the mirror aluminized?
Yes, the mirror is aluminized with a protective film for long-term reflectivity.
Can I use this with a parabolic secondary mirror?
No, the secondary mirror is specified as elliptical plane (35mm minor axis) for this design.
Is the secondary mirror included?
No, the secondary mirror is not included and must be sourced separately.
What is the surface quality?
The mirror is ground and polished to a spherical surface with standard scratch-dig quality for amateur use.

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