Equipment Antlia ALP-T 5nm dual-band filter 14 October 2022 Astronomy Now A dual-passband filter from Antlia that allows imagers to simultaneously capture narrowband data in hydrogen-alpha and oxygen-III light.
Equipment Seeing the sights on Venus: Baader ultraviolet filter 2 October 2014 Steve Ringwood If there is one thing you learn from the outset about Venus, it is that it is permanently shrouded in a blanket of cloud, but this filter will bring out some detail.