D76F300 Astronomical Telescope Reflector Objective Reflection Primary Mirror

Key Benefits

• 76mm diameter provides a large light-gathering area for brighter views of deep-sky objects
• 300mm focal length offers a short focal ratio suitable for wide-field astronomy
• Spherical surface simplifies fabrication and alignment for amateur telescope builders
• Aluminum coating with protective foils ensures high reflectivity and long-term surface stability
• 1/6 wave surface accuracy supports sharp image quality at the focal plane
• Compatible with secondary mirrors up to 20mm minor axis for standard Newtonian designs

Application Scenarios

• Building a Newtonian reflector telescope from a kit or custom design
• Replacing a damaged or worn primary mirror in an existing amateur telescope
• Educational projects in astronomy clubs or science classrooms
• Upgrading a telescope's light-gathering capability for better planetary or nebula visibility
• Testing optical performance in a telescope alignment and collimation setup

Who It Is For

• Amateur astronomers building or maintaining Newtonian reflector telescopes
• Educational institutions teaching optics and astronomy fundamentals
• Science and technology clubs running hands-on telescope projects
• DIY telescope builders sourcing component-level optical parts
• Astronomy hobbyists upgrading mirror performance for improved image quality

Problems It Solves

• A damaged or degraded primary mirror prevents clear imaging and requires full replacement
• Lack of a known focal length or diameter makes telescope design and alignment difficult
• Poor surface accuracy leads to blurred or distorted images at the focal plane
• Unprotected aluminum surfaces degrade quickly under humidity and handling
• Mismatched secondary mirror size limits the usable field of view and optical performance

Technical Features

• Spherical primary mirror shape for Newtonian reflector systems
• 76mm diameter for increased light collection and brighter images
• 300mm focal length for a short focal ratio and wide field of view
• Aluminum coating with protective foils for high reflectivity and durability
• Surface accuracy of 1/6 wave for consistent image quality
• Secondary mirror minor axis of 20mm for compatibility with standard Newtonian designs
• No additional optical elements included; intended for integration into a complete telescope assembly

Specifications

Specifications are taken from the AMADA product data for this item. Confirm critical dimensions with us in writing before ordering.

Customization Options

• Available as a standalone mirror for integration into custom telescope designs
• No options for different diameters, focal lengths, or coatings beyond the listed specification
• Can be paired with compatible secondary mirrors and focuser assemblies

Comparison With Other Options

Use Guide

• Handle the mirror only by the edges to avoid touching the optical surface
• Store the mirror in a dry, dust-free environment with the protective foil intact
• Remove the foil only when mounting the mirror into the telescope tube
• Align the mirror carefully during telescope assembly to ensure proper collimation
• Clean only if necessary, using a soft brush or compressed air; avoid touching the surface