Archived posting to the Leica Users Group, 2014/02/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I'd love to hear Ted's perspective on this thread ;-) Nathan Wajsman Alicante, Spain http://www.frozenlight.eu http://www.greatpix.eu PICTURE OF THE WEEK: http://www.fotocycle.dk/paws Blog: http://nathansmusings.wordpress.com/ YNWA On Feb 22, 2014, at 5:52 PM, Doug Herr wrote: > 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 > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >