For decades, the core technique for precision focusing was the hyperfocal method, especially in landscape images. This makes use of pre-calculated focus distances to quickly set a lens for an acceptable level of sharpness throughout. It is calculated using the formula H = f² / Nc + f, where H is hyperfocal distance, f is focal length, N is f-stop and c is circle of confusion. However, while generally suitable, hyperfocal focusing doesn’t always deliver optimal results. The values used are based on outdated parameters, namely the circle of confusion, which refers to the physical size of a blurred point of light, measured in milimetres.
The term “acceptable sharpness” is also objective, and was originally based on the quality of lenses and film available in the 19th century. In today’s world of ultra-precision optics and high-resolution sensors, the values produced won’t make the most of this quality. Plus, not all scenes are equally structured, resulting in detail loss in the foreground.
The double-distance focusing we’ve tried here is an effective technique for producing a better equality of sharpness from foreground to background, helping us to get more from our equipment. This technique is increasing in popularity among pros and is an easy, all-round solution. So let’s give it a go…