This is the world of the Blackmagic Design Digital Cinema Camera. It is especially useful when adjusting a ZEISS CP.2 cine lens for use on a DSLR camera after the lens mount has been converted from PL to another type (such as EF), or vice versa. The Siemens star sample was placed 371 m downstream of the focal plane. As to focusing manually, imagine a camera with no optical viewfinder, no autofocus, and only an LCD screen to determine manual focus, where fortunately, a single finger double tap brings up 1:1 pixels. The ZEISS Siemens Star Test Chartis a professional lens chart that has been used for decades to set the back focus on lenses used on individual cameras. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. reported on the use of a lens for one-dimensional focusing of hard X-rays.

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Siemens star focus chart