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1872 EUR
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price without VAT: 1522 EUR
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The Daystar QUARK Sodium D-Line filter is designed for solar observing and imaging in the Sodium Na-D line with refractor telescopes. It is a compact all-in-one module combining a Fabry-Perot etalon, a 4.2x telecentric Barlow lens, and a blocking filter in a single housing. The unit is inserted directly into a 1.25" or 2" diagonal, and once a 1.25" eyepiece or suitable imaging accessory is attached, an ordinary refractor can operate as a narrowband solar telescope for Sodium-line observing.
Observing in the Sodium D2 line at 589.0 nm makes it possible to record fine sunspot detail, plage regions, granulation, and with sufficient resolution and seeing, even supergranulation. This wavelength can also reveal flare footprints, also known as flare kernels. The Sodium line is brighter than both Ca-K and Hydrogen Alpha, making visual observing easier and photographic exposures shorter. The filter provides a bandpass of 0.5 Å or narrower, with the actual value typically falling within approximately 0.3-0.5 Å.
• narrowband solar filter for refractors in the Sodium Na-D line
• observing line: Sodium D2 - 589.0 nm
• bandpass of 0.5 Å or narrower
• integrated 4.2x telecentric Barlow lens
• all-in-one design - etalon, telecentric optics, and blocking filter in one housing
• coatings optimized for the 589 nm wavelength
• fully baffled internal construction for improved contrast
• tuning adjustment range of ±0.5 Å with 0.1 Å detents
• USB power supply - 5 V / 1.5 A
• LED indicators for power, warming, ready, and fault status
• 1.25" / 2" input and 1.25" eyepiece output
• compatible with optional 2", T-mount, and C-mount adapters
• best suited to f/4-f/8 refractors
• full-disk observing possible with refractors up to about 450 mm focal length
• Daystar QUARK Sodium D-Line filter
• 90-240 V AC wall power adapter
• international plug adapters
• protective Twist-Case storage box
• manufacturer: Daystar Filters
• model: QUARK Sodium
• SKU: DSZSD
• product type: narrowband solar filter for refractors
• spectral line: Sodium D2
• wavelength: 589.0 nm
• bandpass: approximately 0.3-0.5 Å
• declared maximum bandpass: 0.5 Å
• uniformity: SE (Standard Edition)
• integrated telecentric lens: 4.2x
• telecentric lens construction: 2-element
• blocking filter diameter: 12 mm
• clear aperture: 21 mm
• tuning range: ±0.5 Å
• tuning step: 0.1 Å
• diagonal / focuser input: 1.25" / 2"
• eyepiece output: 1.25"
• compression ring: brass
• power supply: USB 5 V
• required current: 1.5 A
• power adapter included: yes, 90-240 V AC
• warm-up time: about 10 minutes
• compatible telescopes: f/4-f/9 refractors
• recommended focal ratio range: f/4-f/8
• full-disk solar viewing: up to about 450 mm focal length
• additional ERF required up to 80 mm aperture: no
• recommendation for 80-150 mm aperture: UV/IR-cut filter before the diagonal
• recommendation above 150 mm aperture: front-mounted ERF
• compatibility with DayStar Yellow ERF: yes
• compatibility with DayStar Red ERF: no
• off-axis use: no
• warranty: 5 years
The integrated 4.2x telecentric lens significantly increases the effective focal length of the optical system, so the filter works best with longer focal length eyepieces. For larger refractors, an appropriate thermal energy rejection method should be selected in accordance with the manufacturer’s recommendations. The Daystar QUARK Sodium D-Line is intended for users who want to observe the Sun in the less common but very bright and highly interesting Sodium line while keeping the optical setup simple and compact.
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