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I want to take low key portraits like pic related where the background is pitch black. From what I understand this is achieved by picking a high f stop number/high shutter speed until the entire photo is pitch black and using the flash to light the model. I think the highest f-stop my lens goes up to is like f/16 and the shutterspeed is around 1/4000 and I can't get everything to look pitch black. Is it possible to achieve this with my current set up? Also I want to do this outside of a studio where I can't control the lighting for street portraiture.