Because watch photography has very high requirements for the accuracy of the photographed product when shooting the dial below the outer ring, considering the camera set aperture value of f/18 and the use of a macro lens at a very close location to the dial, the depth of field of no more than 2 mm, zoom in to look closely will find that the strap has been in a state of defocus. We need to refocus and, at the same time, make sure that the camera focal plane remains parallel to the dial; otherwise, there will be part of the dial in danger of being out of focus.
