Speed of Focusing Points

wgforster · 23rd of October 2006 (Mon)

My question stems from shooting gymnastics with a 1D2, primarily with a 85/1.8. It seems like my Auto Focus has trouble focusing fast enough for the moving action but without getting into a gymnastics thread, does anyone know if there is a difference in the focusing speed of off-center focusing points. There is one mention in the manual that "if focus can not be achieved with the AF-assist light of a Speedlite select the center AF point. An off-center AF point may not be able to achieve focus." This implies that the center AF point provides some benefit that the off-center points don't. Any ideas?
Thanks,
Bill F.

RgB · 23rd of October 2006 (Mon)

Apparently the centre has higher precision AF.

But someone else perhaps can get a bit more technical than me

Hermeto · 23rd of October 2006 (Mon)

Pretty much everything on that subject is explained HERE.
Welcome to POTN!

23rd of October 2006 (Mon)	#1
wgforster Junior Member Join Date: Oct 2006 Posts: 1	Speed of Focusing Points My question stems from shooting gymnastics with a 1D2, primarily with a 85/1.8. It seems like my Auto Focus has trouble focusing fast enough for the moving action but without getting into a gymnastics thread, does anyone know if there is a difference in the focusing speed of off-center focusing points. There is one mention in the manual that "if focus can not be achieved with the AF-assist light of a Speedlite select the center AF point. An off-center AF point may not be able to achieve focus." This implies that the center AF point provides some benefit that the off-center points don't. Any ideas? Thanks, Bill F.

23rd of October 2006 (Mon)	#2
RgB Senior Member Join Date: Aug 2006 Location: Sydney, Australia Posts: 1,323	Re: Speed of Focusing Points Apparently the centre has higher precision AF. But someone else perhaps can get a bit more technical than me __________________ Daniel Speranza 30D - 580EX II Lee ND Grad Filters---77mmWide Angle Adapter 10-22mm f/3.5-4.5 USM --- 24-70mm f/2.8L USM Website * Flickr * Gear

23rd of October 2006 (Mon)	#3
Hermeto Cream of the Crop Join Date: Oct 2005 Location: Toronto, Canada Posts: 6,657 IMAGE EDITING OK	Re: Speed of Focusing Points Pretty much everything on that subject is explained HERE. Welcome to POTN! __________________ What we see depends mainly on what we look for.

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