× Sunspot region 3421 Date 2023.09.06 Filters 540nm continuum filter and ND1.8 filter Taken by Rainer Additional information Equipment: 130mm f/7 apo, Baader Herschel wedge, Baader FFC Barlow at 3.5X, ZWO ASI 174MM-mini camera. The data is extracted from 24 videos of two minutes each, taken over a period of four and a half hours. Back to Solar System Back to gallery