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MFR Coating: Usable down to f/1
we closely examined the sensitivity curves of today’s popular CCD cameras
Film photography: Fair
6nm offers better contrast
we recommend our standard UHC filter for greater contrast enhancement
Askar FRA400 Astrograph Flat-Field f/5.6 to f/3.9 Telescope svbony usb camera MFR Coating: Usable down toAskar 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
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