There is a focus point for any lens at a given aperture that maximizes sharpness from near to infinity, resulting in the largest possible DOF with "acceptable" sharpness. This is commonly referred to as the hyperfocal distance. For many subjects, setting focus at the hyperfocal distance can be desirable (usually landscapes with something of interest in both the foreground and background, but true for many subjects). The hyperfocal distance is related to the focal length of the lens, the aperture, and the circle of confusion (which relates to both the lens and sensor as I understand it, but may really apply more to the sensor in common usage). "Acceptable" sharpness is somewhat subjective. On a practical level, there are subjects that you want to be sharp near to infinity. If you set focus at infinity, the DOF will be narrower (making near objects blurry) compared to if you set focus closer than infinity which would still keep infinity "acceptably" sharp but bring nearer elements into focus. The usual solution is to stop down the lens, extending the DOF. But for any lens at any aperture, there is an optimal focus point that will create the maximal DOF near to infinity with acceptable focus along the spectrum. Finding this focus point can be a bitch. Focus peaking (only available with an EVF or using LV) is often not accurate. Using rule-of-thumb approximations (especially with AF) are often not accurate. On a tripod using LV and manual focus you can check focus across the frame and find the sweet spot. Time consuming and not really viable with hand held shooting. Zeiss Batis lenses for Sony offer a digital DOF scale based on the lens and the aperture selected. I've used them with some success to nail the hyperfocal distance (often erring on the side of moving the focus more towards infinity to make sure distant elements are sharp at the expense of a loss of near DOF). Why can't AF cameras offer a "hyperfocal AF" option? Meaning, the camera automatically sets focus to the hyperfocal distance based on the attached lens and the aperture for the body being used. Possibly including an option to adjust the distance based on user preference (i.e. tweaked to nearer focus to allow for a nearer DOF or tweaked to infinity focus to ensure sharp infinity at the expense of loss of near sharpness). There are lens issues that wouldn't guarantee across the frame sharpness (i.e. field curvature), but the ability to automatically set the focus of the lens to the hyperfocal distance at a given aperture would seem to be useful for many subjects. One of the things I liked about using a Leica rangefinder was the ability to "zone focus"--i.e. setting focus manually at the hyperfocal distance and then compose without having to think about focus. Possibly I'm missing something and feel free to point out issues. But I've run across this problem for many landscape shots (especially hand held) where I end up crossing my fingers that the focus I chose with AF was close to the hyperfocal distance. Why can't this be an option on any camera with AF to do this automatically (perhaps using lens profiles for interchangeable lens cameras)?