When using a telephoto lens in a low light environment, such as when I photographed these macaques in a dark forest in Bali, Indonesia, depth of field must be a secondary consideration to using a fast enough shutter speed to get a sharp picture. Photography is all about compromises, and in low light situations this is a crucial issue that comes up all the time. The baby and the mother were roughly on the same plane, so that really helped in maintaining sufficient depth of field. Still, I wanted to use at least f/8 just in case there was a small discrepancy where either animal was an inch or two closer to the camera. I was using a focal length of 280mm (70-200mm plus a 1.4 teleconverter), and ideally the shutter should have been at least 1/250th or 1/300th. However, I didn't want to go above 2000 ISO, so with an f/8 aperture I could only get 1/100th of a second. That's what I used, but I also turned on the image stabilizaiton to help with sharpness. This shot was handheld.