Askar Colour Magic Super D1 Duo Narrowband Filter (OIII&Ha), 2 Inch ,Astrophotography ,Astronomy Filters, Increase Contrast and Reduce Light Pollution
Special Features
- FWHM OIII:6.5nm±0.5nm/Ha:8.5nm±0.5nm
- CWL 500.7nm & 656.6nm
- Peak transmittance 85%
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