Orion® UltraBlock™ Narrowband Light-Pollution Filter
If you observe from highly light-polluted sites, get an UltraBlock. It rejects wavelengths from incandescent and uorescent lighting, which wideband lters can’t stop.
If you observe from highly light-polluted sites, get an UltraBlock. It rejects wavelengths from incandescent and uorescent lighting, which wideband lters can’t stop.