DayStar Quark (Chromosphere model)
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DayStar Quark (Chromosphere model)

daystarfilters.com/.../Quark.shtml
Type Hydrogen-alpha (Hα)
Bandwidth 0.05 nm
Size Other
Users 295
Images 3430
Most often used with
ZWO ASI174MM
Known retailers High Point Scientific  ·  Agena Astro ( Back ordered )
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".
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