DayStar Quark (Prominence model)

daystarfilters.com/.../Quark.shtml

Type	Hydrogen-alpha (Hα)
Bandwidth	0.08 nm
Size	Other
Users	16
Images	172
Most often used with	ZWO ASI174MM
Known retailers	High Point Scientific · Agena Astro ( Currently out of stock )

Community notes

A H-alpha etalon filter integrated with a 4.3X telecentric Barlow, optimal for use on refractors with a focal ratio from F/4 to F/8. From the [url=http://www.daystarfilters.com/downloads/QuarkFlyer.pdf]product flyer[/url]: "Due to variation in the end user application, we cannot specify the precise FWHM of the filter. Instead, units of 0.8 - 0.6 Å are classified as PROMINENCE and units of 0.5 - 0.3 Å are classified as CHROMOSPHERE".