How to know if AF was on/off with playback? at DVinfo.net

Nathan Quattrini · November 12th, 2007, 07:32 AM

Is there any indication or way to know while watching a tape if auto focus was on/off? Besindes watching the whole tape and looking for focus flucuations.

Bill Pryor · November 12th, 2007, 09:33 AM

If there's a shot composed so the subject is off to one side and the focus is sharper for the background, then that would indicate the auto focus was on. Auto focus is center-weighted, so it will miss for most composition that is not also centered. That would be the only way to tell.

November 12th, 2007, 07:32 AM	#1
Nathan Quattrini Major Player Join Date: Jan 2007 Location: Warwick, Rhode Island Posts: 740	How to know if AF was on/off with playback? Is there any indication or way to know while watching a tape if auto focus was on/off? Besindes watching the whole tape and looking for focus flucuations. __________________ Cinematography Site

November 12th, 2007, 09:33 AM	#2
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	If there's a shot composed so the subject is off to one side and the focus is sharper for the background, then that would indicate the auto focus was on. Auto focus is center-weighted, so it will miss for most composition that is not also centered. That would be the only way to tell.