Filter

DayStar Quark Sodium Na D

Powered eyepiece-style solar filter with Fabry-Perot etalon

Sodium Na D line at 589.6nm (5895.9A)

Sub-Angstrom bandpass, about

0.3 to 0.5A

Plus or minus 0.5A wing-shift tuning

Built-in two-element 4.2x telecentric Barlow, fully baffled

12mm blocking filter

1.25-inch snout

USB-powered

5V 1.5A

For refractors f/4 to f/9

Requires a front-aperture energy-rejection filter