Shooting with a 2" homemade extension tube and a 24-120 lens on a Nikon D750 camera I was trying to capture a close up of a yellow rose. I had the ISO at 640, +2 exposure value, aperture priority, a window open beside the flower, room lights on, and two flashlights on the subject. It is very difficult to get enough light to focus the camera and it still gave me this very soft focus.
