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At the heart of most Hydrogen Alpha solar telescopes lies the etalon filter
Speaking of which
Perfect affordable gift for science teachers
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Optolong L-Quad Enhance Filter 2" Optolong At the heart of mostDescription L Quad Enhance Filter is a quad bandpass light pollution suppression filter for colour cameras. Better suppression of starbursts; Higher contrast and more details of the celestial bodies; Better colour saturation; Great performance on signal to noise ratio (SNR); Near IR cut off to 1000nm, reducing the effects of IR noise; Good for night sky from Bortel 1 to Bortel 7 levels; Suitable for wide range of deep sky targets cover most nebulae,
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