Auto focus at higher f-stops at DVinfo.net

Jim Snow · July 13th, 2009, 04:12 PM

Does a camcorder autofocus as well at more closed aperture positions? (assuming correct exposure)

Jeff Donald · July 13th, 2009, 04:20 PM

Most AF lenses use contrast as a means of determining correct focus. Various things can affect contrast, including filters, lighting, subject, and to some degree the lens opening. But given your assumption of enough light for proper exposure, then the higher f/number should not have an affect on proper AF.

July 13th, 2009, 04:12 PM	#1
Jim Snow Trustee Join Date: Mar 2009 Location: Santa Clara, CA Posts: 1,104	Auto focus at higher f-stops Does a camcorder autofocus as well at more closed aperture positions? (assuming correct exposure)

July 13th, 2009, 04:20 PM	#2
Jeff Donald Warden Join Date: Mar 2002 Location: Clearwater, FL Posts: 8,287	Most AF lenses use contrast as a means of determining correct focus. Various things can affect contrast, including filters, lighting, subject, and to some degree the lens opening. But given your assumption of enough light for proper exposure, then the higher f/number should not have an affect on proper AF. __________________ Jeff Donald Carpe Diem Search DVinfo.net for quick answers \| Where to Buy? From the best in the business: DVinfo.net sponsors