Baader Ultra-Narrowband 3.5nm H-alpha CCD-Filter 50x50mm square
- Precision grade enforced H-alpha filter for f/10 to f/3.5 optical systems
- Opens up the extremely narrow 3,5nm H-alpha world
- This enforced contrast results in even fainter stars, providing more signal of faintest nebulae detail
- Manufacturing such ultra-narrow filter does require extreme coating homogeneity and very high CWL precision, which these filters are designed for. CWL= Center-wavelength / FWHM= full width half maximum.
Note: In general this DeepSky Ultra-Narrowband H-alpha Filter is not suitable for solar observation. The Halfbandwidth of 3,5nm equals 35 Ångstroem, high-quality H-alpha solar filter from SolarSpectrum start at 0.8 Ångstroem. At favorable conditions experiments might still be possible, although at lesser quality.
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