DayStar SODIUM Quark Solar filter

Daystar Filters’ Sodium QUARK Na D-Line Eyepiece Solar Filter is built to use a traditional nighttime astronomical OTA for solar observation. It departs from traditional K-line tuned filters, and focuses on the 5895.9Å D-line wavelength. This wavelength is very narrow but also very bright, so a specialized filter is required to isolate it. Na D-line is a low excitation line emitted when the low chromosphere is heated, usually at footprints of flux loops passing through a flare, as sodium D line reflects the lower chromosphere it shows impulsive-phase flare eruption kernels. Visual and photographic images will also reveal sunspot detail, plague, and granulation, but are much brighter and more easily visible. This configuration of the QUARK is not suited for off-axis application.

Filter Properties :

• Tuned to sodium Na D-line 5895.9Å wavelength
• Use to view impulsive-phase flare eruption kernels, sunspot detail, plague, granulation
• Integrated 12mm blocking filter with a 21mm clear filter aperture
• Tuning knob allows for ±0.5Å wing shift for Doppler-shift compensation
• Markers at every 0.1Å for reference and repeatability
• Optical coatings are engineered for the Na D-line 589nm wavelength
• Internal baffles improve image contrast
• Compatible with yellow glass ERFs — red filters will not pass Sodium
• Use and Handling
• Use traditional astronomical telescopes for solar viewing
• Standard configuration: Accepts 1.25″ eyepieces and astrophotography adapters/accessories
• Integrated 4.2x Barlow lens to effectively boost the magnification of any eyepiece used
• Telecentric lens configuration ensures consistent image quality across the field of view
• Includes a 1.25″ snout, with an optional 2″ available to fit larger drawtubes
• LED indicators for power, warming, ready, and fault
• Recommended OTA Specifications
• No aperture limitation
• f/4 to f/8 refractor OTAs in full aperture
• Full disk viewing on refractors with a focal length up to 450mm
• Rear UV/IR cut filters recommended
• Not suited for off-axis application

Power:

• 5 VDC, 1.5A micro-USB port
• 90-240 VAC wall adapter
• Set of international outlet plugs for US, UK, EU, and Australia