Why the Sodium line?

• High-resolution sunspot detail, granulation and super-granulation depending on seeing quality.
• Observation of flare footprints (solar flames starting with the Sodium ends before the white).
• Brighter line than Calcium or H-alpha: visible images with short exposure times.
• D2 filter at 5890 Å with FWHM 0.5 Å or less.

Key features

Instructions for use

• Insert the Quark directly into the angled guide of the F/4-F/8 refractor.
• No need for additional adapters thanks to all-in-one design.
• Compatible only with yellow glass ERF filters. Red glass filters do not transmit the Sodium line.
• Optimized for visual observation and short-exposure solar imaging.

Remarks

• Assembly using Fabry Perot Etalon technology from DayStar.
• Delivery on request: advance booking required.
• All purchases and repairs subject to sales conditions and advance replacement policy.