Antlia 200F4 Ha&CaK Solar Newtonian Reflector Primary Mirror 200 mm

Antlia SOLAR 200F4 Ha & CaK 200 mm f/4 Primary Mirror for Solar Newtonian Telescope (Antlia) is a parabolic quartz mirror developed for building a specialised system intended for solar imaging. Its multilayer dielectric coating selectively reflects light in the H-alpha and CaK regions while reducing the amount of energy transmitted to downstream components in the optical train. The mirror provides only the first stage of energy reduction and must be used with an additional ERF filter and a suitable final filtering module.

Key features

• 200 mm diameter, 800 mm focal length and f/4 focal ratio
• parabolic optical surface designed for a Newtonian telescope
• low-thermal-expansion quartz glass substrate
• precision polishing of both substrate surfaces
• optical surface accuracy better than λ/8 P-V
• multilayer dielectric coating optimised for the H-alpha and CaK bands
• reflectivity exceeding 99% in both operating bands
• first-stage spectral selection and solar-energy reduction function
• no conventional aluminium reflective coating
• intended exclusively for solar astrophotography

Items included

• Antlia SOLAR 200F4 Ha & CaK 200 mm f/4 primary mirror, without mounting cell

Technical specifications

• product type: primary mirror for a solar Newtonian telescope
• optical surface shape: parabolic
• diameter: 200 mm
• focal length: 800 mm
• focal ratio: f/4
• substrate material: low-thermal-expansion quartz glass
• manufacturing process: precision polishing of both surfaces
• optical surface accuracy: better than λ/8 P-V
• coating type: multilayer dielectric / dichroic coating
• H-alpha band: 656.28 nm
• CaK band: 393.37 nm
• reflectivity in the H-alpha and CaK bands: greater than 99%
• stated combined spectral bandwidth: approximately 150 nm
• conventional aluminium coating: no
• energy-reduction function: first stage of thermal protection for the optical train
• intended use: solar imaging in the H-alpha and CaK bands
• visual observation: prohibited
• required additional protection: Antlia 2" Dualband ERF filter and an appropriate H-alpha or CaK filtering module
• mirror cell: not included

The mirror enables the construction of a chromatic-aberration-free 200 mm solar telescope intended for recording fine solar-surface detail in the H-alpha and CaK bands.