149 NW OO Hwy., Warrensburg, MO 64093
DayStar Filters introduces the Quark ($995), a compact solar hydrogen-alpha filter for fast refractors. This electronically controlled, temperature regulated etalon features a 21-mm clear aperture with integrated telecentric Barlow lens and 12-mm blocking filter. Users of fast 80-mm refractors can simply place the unit in their diagonal, add a low-power 1¼-inch eyepiece, and start enjoying views of the Sun's dynamic chromosphere. Available in chromosphere and prominence versions, the Quark unit fits in both 1¼- and 2-inch focusers, and requires no additional filters when used with 80-mm or smaller refractors with focal ratios of f/4 to f/9 on non-tracking mounts. Each purchase comes with a plastic case, end caps, and an AC power supply with international plug adapters. An optional thread-on UV/IR blocking filter to mount in front of your diagonal or full-aperture energy-rejection filter is recommended for use on tracking telescopes of up to 6-inch aperture. Not recommended for oil-spaced objectives or off-axis applications. See DayStar's website for additional details and accessories.
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