× Sunspot 3413 Date 2023.08.24 Filters 540nm continuum filter and ND1.8 filter Taken by Martin Additional information Sunspot 3413 with a remarkable complex structure and a beautiful penumbra. Equipment: 130mm f/7 apo, Baader Herschel wedge, Baader FFC Barlow at 3.5X, ZWO ASI 120MM-mini camera. Back to Solar System Back to gallery