Legendary cinematographer Peter James ACS ASC explains the "harp test" (also known as a nail chart). It is a classic method for checking lens accuracy and depth of field. It’s a reminder of how technical precision, storytelling, and creative choices intersect in cinematography, and how lens imperfections can even be used intentionally for effect. #Cinematography #PeterJames #CameraPrep #CinemaLenses #Panavision