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More than 40 years ago, the Daystar founder Del Woods began manufacturing narrow band H-alpha filters for solar observation. These filters are used by both amateurs and universities alike, and have even flown into space aboard the space shuttle.
In 2014, DayStar introduced a new H-alpha filter under the trading name QUARK. The QUARK revolutionised solar observation because it offers very high contrast at a reasonable price, and can be used with existing refractors.
The QUARK module is now also available for other wavelengths, and DayStar also offers it pre-installed into refractors.
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DayStar
T2 adapter for QUARK filter
$ 104.00
ready for shipping in 24
h
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DayStar
C-Mount adapter for QUARK filter
$ 104.00
ready for shipping in 3-6
months