Fstoppers | Video Blog for Creative Professionals. AF Microadjustment Tips. By John Reilly (neuroanatomist) Autofocus microadjustment (AFMA) is a procedure that allows a user to correct for small errors of front- or back-focusing.
It is a feature that is present only on certain models of Canon dSLRs (currently, the 50D, 7D, 5D Mark II, 1D Mark III, 1D Mark IV, 1Ds Mark III, and 1D X). AFMA will have the greatest benefit for lenses with fast apertures (f/2.8 and wider), because the thin depth of field at wide apertures makes even small focus errors more evident. This tip comprises two main sections, a practical summary of the procedure for those who want to dive right in, followed by more technical discussion, including some DIY options for a testing setup. The Procedure. Photographic Blog - Help, Advice & Tutorials about Photography. Belgiumdigital - Startpagina. DIYPhotography.net | Photography and Studio Lighting.