Antlia

Antlia Solar Discover Dualband ERF filter 200 mm in cell

The photographic filter increases contrast on the solar surface in the calcium and H-alpha ranges.

• Telescope side connection is 1.25" and 2".
• Camera side connection is 2" with ring clamp
• The filter has a wider transmission in the calcium and H-alpha ranges
• Enhances the contrast of sunspots, granulation and details on the edge of the "solar disk
• Ideal for use with a Herschel prism
• Not intended for visual observation

The filter reflects heat radiation and is designed for small refractors and camera lenses. It is necessary for H-alpha and calcium solar photography.

• 2" filter thread with M48x0.75 external thread - low profile mount
• Suitable for use in front of the H-alpha or calcium attachment for refractors up to 100mm aperture
• Suitable for small camera lenses or refractors in front of the lens
• 25 nm transmission in the H-alpha and calcium range - Transmission 90
• Min. 1/4 lambda accuracy - plane-parallel discs in high quality cell