Archived posting to the Leica Users Group, 2014/02/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Frank Filippone wrote: >>> ( why there really is a fine focus adjust feature in higher end cameras.. camera AF is adjusted by the user to nail down the precise focus location. <<< AF micro-adjust is on DSLR cameras so that the user can compensate for the differences between the image plane at the AF sensor and at the image sensor, and for differences in the phase-detect system's assumption of the lens' focal length and the actual focal length (read: manufacturing tolerances). A camera using the image sensor as the AF sensor eliminates the image plane discrepancy and a phase-detect + contrast-detect system such as used by the A7 eliminates the phase-detect system's focal length assumption discrepancy. The A7 (and A6000) should have no need for AF micro-adjustment, likewise the A7r which is contrast-detect only. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com