Moderators: Greg Downing, E.J. Peiker

All times are UTC - 5 hours

« Previous topic | Next topic »  
Reply to topic  
 First unread post  | 2 posts | 
by Scott A. Flaherty on Sun Nov 12, 2017 7:06 am
User avatar
Scott A. Flaherty
Forum Contributor
Posts: 1386
Joined: 30 Nov 2003
Location: Columbus, Ohio, USA
Is here any correlation between the values returned from Nikon's Auto AF Fine Tune and those values you need to enter via Sigma's dock (puck) for Sigma's Art and/or Sports lenses? 
Scott Flaherty
"No man, however great, is known to everybody and no man, however solitary, is known to nobody." Thomas Moore (1779-1852)

by E.J. Peiker on Sun Nov 12, 2017 8:42 am
User avatar
E.J. Peiker
Senior Technical Editor
Posts: 82322
Joined: 16 Aug 2003
Location: Arizona
Member #:00002
There is little correlation of Nikon's auto AF fine tune to anything including correct focus unfortunately.... The numbers can swing wildly from test to test taken back to back. But to answer your question in a different way, 1 point of adjustment in Nikonese is close to but not exactly 1 point of adjustment in Sigmaese. So the way to do it is to draw a matrix for all of the adjustments that the Sigma dock allows for your lens, then measure each of those situations using Nikon's AFFT (manually, not the automatic method with a long ruler attached to a lens align II and the camera tethered to a computer so that you can make an accurate determination). Once the table is complete, enter all those values in the lens and reset the camera to zero offset. Now do it all again and adjust the values in the table by the amount of the new readings and enter those new values into the lens via the dock. That will get you very close. You can go for a third round if you want to really fine tune them some more.

Display posts from previous:  Sort by:  
2 posts | 

Powered by phpBB® Forum Software © phpBB Group