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Pixel Perfect
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Re: Volleyball. Would 45 point AF helped?


OntheRez wrote:
I suspect that anyone who shoots sports has shots like the one below - perfect action, incorrect focus. When I first saw this I wondered if there was a back focus problem (I have the 85mm f/1.8 MA to -7) but checking the focus point shows that it is exactly on the left hand red backed chair. Most likely this is idiot user error. I simply didn\'t get the center focus point lined up quick enough. (1DIV, ISO 6400 - very dark gym - Tv mode, SS = 1/800, f/2.2, AIServo, center AF point selected.) My question for sports pros particularly for those who have shot some volleyball, would using a different focus mode have helped? Currently I have Cfn III - 8 set to 1 left/right AF point and Cfn III - 2 (AI Servo tracking) set at zero - the center. I have the AF center point selected (also spot metering). This seems to work OK outside on the very dark football field (where ISO 25600 is still a stop slow), but I\'m not getting as good of a success rate with these settings indoors shooting VB. Is it possible that I\'d improve my hit rate by going to all 45 points? The \"accepted wisdom\" suggests that center AF point is best for action shooting, but that leaves no margin for error. (Lordy knows I could use a margin )

This was the most intense match I\'ve ever covered as the 2 teams were fighting for a state birth and the match went 5 games, all past game point. I now understand why some folks claim VB is a \"full contact\" sport. Lots of girls digging kills off the floor.

Would appreciate insight from anyone who has done this type of shooting.

Robert


In DPP it\'s very instructive to use the feature that allows you to see the AF points and what acquired focus (alt+L). That shot looks like the chosen AF point fell on the background. I would try the following settings

CFn III-2 -1 or -2
CFn III-8 2 (eight expansion points)
CFn III-V 1 (Continuous focus)

III-2 will allow more time for the AF to remain focused where it was supposed to be if the AF point slips off the target, III-8 will give you more points to assist the main AF point if you miss the intended focus point and III-IV will ignore obstacles in the foreground that land on the main AF point


This is an excellent pdf AF guide for the 1D IV.
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&ved=0CDIQFjAD&url=http%3A%2F%2Fmedia.the-digital-picture.com%2FInformation%2FCanon-EOS-1D-Mark-IV-DSLR-Camera-Guide.pdf&ei=UZ-AUPKSJc3OigLby4GIBQ&usg=AFQjCNH6ctDRG68iqUrnRBzfm0ik9pGO8w






Oct 18, 2012 at 07:33 PM





  Previous versions of Pixel Perfect's message #11052020 « Volleyball. Would 45 point AF helped? »