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DayStar Filters

Daystar Filters' Magnesium I Quark B2 Line Eyepiece Solar Filter departs from the more popular H-alpha tuned filters and focuses on the highly magnetized high energy in the bright 5172.8? wavelength. The temperatures for energetic activity emitting the B2 line are calculated to be extremely high. Spectroscopically, a line "splitting" called the Zeeman effect can be observed, whereas the dark absorption "splits" and occurs slightly above and below the typical wavelength where light from non-magnetized activity is absorbed. Views through a magnesium filter reveal plage and dark absorptive mottling of the chromospheric structure. The line is brighter than calcium, H-alpha, and even sodium, so it is very easy for observers to see and will require short exposures when imaging in this wavelength.While there are no OTA aperture limitations, Daystar recommends the use of rear UV/IR cut filters for long-duration solar viewing sessions, an energy rejection filter for safety, and for best results they suggest using refractor-style scopes with focal ratios between f/4 and f/8. You can enjoy full-disk viewing with focal lengths up to 450mm.This all-in-one filter design enables the use of nighttime telescopes for solar viewing and is engineered to eliminate unnecessary components, which reduces the size and weight. This streamlined form enables it to simply insert into 1.25" or 2" diagonals and accept 1.25" eyepieces. The filter is powered via a micro-USB port, and Daystar includes a power cord and an AC adapter to meet the high-power requirements of 5 VDC 1.5A. To enable its use at home and abroad, a set of international outlet plugs is provided with adapters for the US, UK, EU, and Australia.Filter Properties Tuned to magnesium I B2-line 5172.8 wavelengthMagnesium is a bright green color that is easily visible in the center of the human eye's highest sensitivityVery bright wavelength is easy to see and requires short exposure times when imagingUse to view the boundary layers between granulation and spicule, heavy surface mottling and high contrast granulation; it shows plage in equal or higher detail as the calcium line and reveals Zeeman splitting in absorption of magnetized areas of active regionsIntegrated 12mm blocking filter with a 21mm clear filter apertureTuning knob allows for 0.5 wing shift for Doppler-shift compensationMarkers at every 0.1 for reference and repeatabilityIntegrated 4.2x Barlow lens magnifies image slightly2-element telecentric lens design produces flat views with limited edge distortionOptical coatings are engineered for the Mg B2-line 517nm wavelengthInternal baffles improve image contrastLED indicators for power, warming, ready, and faultMounting Eyepiece design allows it to drop into standard telescope holdersDual 1.25"/2" eyepiece snouts make it compatible with a wide variety of drawtubes and focusersAccepts 1.25" eyepieces and astrophotography adapters/accessoriesRecommended OTA Specifications No aperture limitationf/4 to f/8 refractor OTAs in full apertureFull disk viewing on refractors with a focal length up to 450mmRear UV/IR cut filters recommendedEnergy rejection filter recommended for safetyNot compatible with red or yellow glass energy rejection filtersPower Low consumption allows long use with external battery packs5 VDC, 1.5A micro-USB port90-240 VAC wall adapterSet of international outlet plugs for US, UK, EU, and Australia