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Home / Products / Astronomy Mirror / D305F1200 305mm Telescope Main Mirror Pa
D305F1200 305mm Telescope Main Mirror Parabolic Primary Mirror Large Diameter

D305F1200 305mm Telescope Main Mirror Parabolic Primary Mirror Large Diameter

D305F1200 is a 305mm parabolic primary mirror for Newtonian reflector telescopes, designed for high-precision astronomical observation. The mirror has a focal length of 1200mm, edge thickness of 28–30mm, and a net weight of 6kg. It features an aluminum reflective coating with a silica protective layer, achieving 1/6 PV surface accuracy for sharp image quality in deep-sky and planetary imaging.

  • 305mm diameter provides large light-gathering capacity for faint celestial objects
  • 1200mm focal length enables high magnification and detailed planetary imaging
  • 1/6 PV surface accuracy ensures minimal optical aberrations for clear, sharp images
  • Aluminum coating with silica protective layer resists oxidation and maintains reflectivity
  • Edge thickness 28–30mm offers structural stability and thermal resistance
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Technical features

  • Diameter: 305mm
  • Focal length: 1200mm
  • Surface shape: Parabolic
  • Surface accuracy: 1/6 PV
  • Edge thickness: 28–30mm
  • Net weight: 6kg
  • Coating: Aluminum reflective film with silica protective layer
  • Material: Glass substrate (standard for precision mirrors)

Who it is for

  • Amateur astronomers building or upgrading Newtonian reflector telescopes
  • Educational institutions developing astronomy lab equipment
  • Professional observatories sourcing precision mirrors for telescope systems
  • Distributors offering telescope components for assembly and resale

Specifications

Diameter305mm
Focal Length1200mm
Surface Accuracy1/6 PV
Edge Thickness28–30mm
Net Weight6kg
CoatingAluminum + Silica Protective Film
Surface ShapeParabolic
ApplicationNewtonian Reflector Telescope

Use guide

  • Confirm telescope tube length and focuser compatibility with 1200mm focal length
  • Ensure mounting flange or cell design matches the mirror's edge thickness (28–30mm)
  • Use with a secondary mirror of appropriate size and focal ratio to match the primary
  • Clean only with lint-free cloth and approved optical cleaning solution to preserve coating

FAQ

What is the surface accuracy of this mirror?
1/6 PV, verified via interferometric testing.
Is the coating durable for outdoor use?
Yes. The aluminum reflective film is protected by a silica layer to resist oxidation and environmental wear.
What is the net weight?
6kg, suitable for stable mounting in most telescope structures.
Can I mount this mirror directly into a telescope?
Yes. It can be mounted with a custom cell or flange. Edge thickness is 28–30mm for structural support.
What is the focal length?
1200mm, designed for Newtonian reflector systems.

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