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negative-example for my observation point: in bortle 8-9 over power plant and industrial area in S, only uv_ir filter; Samy 135mm; mod. Canon 750d; 33x32 sec: from June 24th, 2023

negative-example for my observation point: in bortle 8-9 over power plant and industrial area in S, only uv_ir filter; Samy 135mm; mod. Canon 750d; 33x32 sec: from June 24th, 2023

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