I am trying to take some pics of my grandson using low key. Is aperture value best with a soft light in darkness? Looking at youtube people seem to be able to do this in daylight? Are the images processed in Photoshop or something to get the total black background? How would fellow nikonites go about this? I have a 50mm autofocus lens. F1.8. Is this a good lens for low key? This is one of my weekend projects coming up. Thank you