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D203F750 Telescope Primary Mirror Objective Lens Group Focal Length 750mm

D203F750 Telescope Primary Mirror Objective Lens Group Focal Length 750mm

D203F750 is a spherical primary mirror objective lens group for telescopes, manufactured in the Chinese mainland. It has a diameter of 203 mm, a focal length of 750 mm, and a surface coated with aluminum and protective foils. The mirror is designed for use in astronomical observation systems requiring a large aperture and long focal length.

  • 203 mm diameter provides high light-gathering capacity for deep-sky and planetary observation
  • 750 mm focal length enables high magnification with long focal ratio systems
  • Aluminum surface with protective foils ensures stable reflectivity and resistance to oxidation
  • Spherical design simplifies manufacturing and alignment for amateur and educational telescope builds
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Technical features

  • Primary mirror diameter: 203 mm
  • Focal length: 750 mm
  • Mirror type: spherical
  • Surface coating: aluminum with protective foils
  • Weight: approximately 1350 grams
  • Secondary mirror dimensions: long axis 109 mm, short axis 70 mm, thickness 9 mm
  • Secondary mirror material: aluminum with protective film
  • Origin: Chinese mainland

Who it is for

  • Amateur astronomers constructing or maintaining reflector telescopes
  • Educational institutions developing hands-on astronomy labs
  • Telescope assemblers sourcing components for custom telescope builds

Specifications

ModelD203F750
Mirror TypeSpherical Primary Mirror
Diameter203 mm
Focal Length750 mm
Surface CoatingAluminum and Protective Foils
WeightApproximately 1350 grams
Secondary Mirror Long Axis109 mm
Secondary Mirror Short Axis70 mm
Secondary Mirror Thickness9 mm
OriginChinese mainland

Use guide

  • Use only with compatible telescope tubes and focuser systems that support 203 mm aperture
  • Ensure secondary mirror alignment is precise to avoid image degradation
  • Handle with care to avoid scratches on the aluminum-coated surface

FAQ

What is the focal length of this mirror?
750 mm
Is the mirror spherical or parabolic?
Spherical
What is the diameter of the primary mirror?
203 mm
What coating is used on the mirror surface?
Aluminum with protective foils
Can this mirror be used in a Newtonian telescope?
Yes, it is designed for use in Newtonian reflector systems

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