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offering convenience for outdoor sky observation
an H-alpha filter is the best choice for all nebulae glowing red
Having high QE means more of the light that enters your telescope and reaches the sensor is actually used
we closely examined the sensitivity curves of today’s popular CCD cameras
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Askar FRA400 Astrograph Flat-Field f/5.6 to f/3.9 Telescope svbony usb camera offering convenience for outdoor skyAskar FRA400 Flat Field Astrograph The Askar FRA400 is part of the acclaimed Askar FRA (Flat field Refractive Astrograph) series, designed for high quality astrophotography and visual observation. With built in flat field correction and excellent control of chromatic aberration, the FRA400 delivers sharp, colour accurate stars from centre to edge even on full frame sensors. Flat Field Design for Full Frame Imaging The FRA400 optical system uses a
