D203F750 Telescope Primary Mirror Objective Lens Group Focal Length 750mm

Key Benefits

• 203mm diameter provides a large light-gathering area for deep-sky and planetary observation
• 750mm focal length delivers a moderate focal ratio suitable for wide-field and detailed imaging
• Spherical surface simplifies manufacturing and alignment for amateur and educational telescope builders
• Aluminum surface with protective foil maintains reflectivity and resists oxidation during storage and handling
• Standard secondary mirror holder dimensions allow compatibility with common Newtonian focuser designs

Application Scenarios

• Assembly of a Newtonian telescope for amateur astronomy or educational outreach
• Replacement of a damaged primary mirror in a 203mm aperture telescope system
• Integration into a custom telescope design for astrophotography or visual observation
• Use in a university or school lab for teaching optical principles in reflecting telescopes
• Component-level upgrade in a telescope system where focal length and aperture must be preserved

Who It Is For

• Amateur astronomers building or maintaining Newtonian reflector telescopes
• Educational institutions teaching optics and telescope mechanics
• Telescope kit suppliers sourcing component mirrors for assembly
• Research labs requiring a standardized primary mirror for prototyping
• Hobbyists upgrading or repairing existing telescope systems

Problems It Solves

• A damaged or degraded primary mirror in a telescope system can be replaced without replacing the entire optical tube
• A builder needing a specific 203mm aperture and 750mm focal length mirror can source a compatible component without custom fabrication
• An educational lab can use a standard mirror to demonstrate spherical aberration and mirror alignment techniques
• A telescope kit manufacturer can integrate a known-specification mirror into a consistent product line
• A user with a non-standard mirror can match a replacement by diameter, focal length, and secondary holder size

Technical Features

• Spherical primary mirror with 203mm diameter and 750mm focal length
• Aluminum surface with protective foil coating to prevent oxidation
• Secondary mirror holder with 109mm (long axis) and 70mm (minor axis) dimensions
• 9mm thickness for structural rigidity and thermal stability
• Weight of approximately 1350 grams for stable mounting in a telescope tube

Specifications

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

Customization Options

• Mirror surface can be specified for different coatings (e.g., enhanced aluminum) upon request
• Secondary mirror holder dimensions can be adjusted for compatibility with specific focuser designs
• Surface finish can be modified to parabolic for reduced spherical aberration if required
• Mirror can be supplied without protective foil for immediate integration into a custom system

Comparison With Other Options

Use Guide

• Handle the mirror only by the edges to avoid fingerprints on the optical surface
• Remove the protective foil only when ready to install the mirror in the telescope tube
• Align the secondary mirror holder with the focuser's central axis using a collimation tool
• Use a soft cloth and lens cleaning solution only if the surface is visibly soiled; avoid direct contact with the aluminum layer
• Store the mirror in a dry, dust-free environment with the protective foil intact