Certain lenses with a very large maximum aperture, such as the EF 50/1.2L, exhibit focus shift. One way to compensate for this phenomenon is to focus while activating DOF preview, from f/1.4 - f/2.8, and sometimes down to f/4.
Certain lenses with a very large maximum aperture, such as the EF 50/1.2L, exhibit focus shift. One way to compensate for this phenomenon is to focus while activating DOF preview, from f/1.4 - f/2.8, and sometimes down to f/4.