If you are lucky enough not to use low-light lenses (the viewfinder image is noticeably darker than the standard disc) and do not always want to rely on autofocus, this focusing screen is a must. I wonder how many people do not believe (or not) to be able to focus manually and do not even know that it simply does not work with the standard disc. It is simply too vague. At last I can focus accurately even with large aperture like 1.8 or 1.4 again. NEVER WITHOUT THIS ADJUSTMENT.
