Filter – Astronomy Now

6 April 2026

Latest News

[ 2 April 2026 ] Witness to history: Artemis II, lunar exploration and hope News
[ 25 March 2026 ] Artificial Intelligence uncovers more than 100 new worlds in NASA data News
[ 24 March 2026 ] XRISM solves gamma-Cas’s 50-year X-ray mystery News
[ 16 March 2026 ] Molten lava world points to new class of planet Focus on
[ 26 January 2026 ] Dr Allan Chapman (1946-2026) News

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.

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.