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VHF band transmission
reducing the likelihood of dew forming during extended overnight imaging
providing enhanced signal-to-noise ratio and reducing imaging time
You can select filters with 12nm or 6nm bandwidth (FWHM) for the three most important emission lines in astrophotography: oxygen (OIII)
Askar FRA600 f/5.6 Quintuplet Astrograph APO Sharpstar Optics VHF band transmissionAskar FRA600 f 5. 6 Quintuplet Astrograph APO Refractor Telescope The Askar FRA600 is a member of the FRA (Flat field Refractive Astrograph) series, designed for full frame astrophotography and refined visual observing. Its 5 element Petzval like design with two ED elements provides a naturally flat field, excellent colour correction, and crisp, round stars across a generous 66 mm image circle. Highlights 108 mm aperture 600 mm focal length f 5. 6
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