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City DSLR astrophotography-25hrs on NGC5139
1500 x 1 min subs at ISO 100 using Samsung DSLR on 80mm refractors at F7.5 or thereabouts. Johannesburg white/red zone; Stacked and processed in Pixinsight;
Running 4 80mm is parallel so equiv aperture is 80*Sqrt(4) and equiv focal ratio is F7/Sqrt(4) (160mm at F1.9).
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