I will use a flash in a completely darkened room, with your permission. If you prefer I not use flash I ask that we have some source of light, if only from a lamp. I use a speed flash, and bounce it over my shoulder, so it isn’t as disturbing as it sounds. However, I do have a camera that works very well in low lighting conditions (Nikon D700), that just means grainier pictures with less clarity. Other equipment in my bag: 85mm 1.8 lens, 50 mm 1.4 lens, 70-200mm 2.8 zoom lens, and a 24-70mm 2.8 lens. I usually stick to the 50mm or 85mm lens.