Astro Product Reviews, • 4/19/25 iOptron CEM40 Field Experience Previous Need an OIII filter? My experience with the Astronomik maxFR OIII 2" filter Next iOptron CEM40 Unboxing You Might Also Like Need an OIII filter? My experience with the Astronomik maxFR OIII 2" filter Canon Ra First Impressions-Part 2 Canon Ra First Impressions-Part 1 Almost Heaven Series: Spruce Knob Comet Tsuchinshan-Atlas (Comet 2023 A3) visits the northern hemisphere in October evening skies.
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