Filter – Astronomy Now

30 March 2023

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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.