Will Cheung
Focusing with a manual-focus camera is simple because there are helpful aids, such as microprisms and split-image rangefinders. However, on a digital camera, there are useful electronic tools. Focus peaking is a powerful one and what you see is the image overlaid by a false colour (there’s usually a choice of colours). Adjust the lens focusing ring and when the coloured outline is at its strongest around the subject that is when it’s sharp. My preference is to use the focus magnifier. There is usually the option of assigning the magnifier to a button so you can check focus with a button press and return to a normal view with another push. The other common option is that the magnifier automatically kicks in when the focus ring is adjusted.