The focusing ring is not coupled with the camera’s rangefinder.
Therefore, it is not possible to focus with the
camera‘s viewfinder. Due to this lens’ extraordinarily large
depth of field, it is sufficient to set an estimated range.
There are two 1 m and 2 m marks on the focusing ring.
Both marks can be recognized when looking through the
shoe-mount viewfinder. This allows you to simultaneously
set the image section and the standard range.
Example: Aperture 4 and a range setting of 2 m result in
a depth of field range of 1 m to infinity.