skibum5
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apdieb wrote:
The AF sensors on the 9pt system are bigger and often miss on subjects that are not filling enough of the frame. I find the AF system works well on distant objects, provided you have the lens/reach to fill a decent amount of the frame. I shot pro hockey game, airshow and a HS Football game with it and the 300IS F2.8 and it did remarkably well. I definitely saw drop off in the AF speed/accuracy though when not using a F2.8 or better lens. When I combined my 2x extender to make it F5.6, it noticeably dropped off. With the MKIII, it's AF continued to be fast and responsive at F5.6 (300 + 2X ext)...
I agree with the post above about using good lenses. This body shines when using nice primes.
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well the tree had nothing else around it but balnk sky and it was much larger than the center focus point area so it's kind of surprising that it caused so much trouble.
sometimes the cam would 'lock focus' and you look at the pic and the focus is off by plus or minus 50-80' on an object maybe 200-300' away.
all i know is i've seen all sorts of issues with the AF over the years for lenses with wide aps if you try to shoot as such and the subject is more than maybe 8's is or so away.
contrast AF nailed it 100% of the time, but phase.....
i would focus on something near swing up to the tree it would lock focus then repeat and get tack sharp, sharp, beyond a bur, blur, tack sharp, tack sharp, sharp, sharp, beyond a blur, blue, blur, tack sharp, tack sharp, tack sharp, blur, sharp, beyond a blur, sharp, sharp, sharp, blur, tack sharp, tack sharp, blur, tack sharp, tack sharp, tack sharp, beyomd a blue, tack sharp, tack sharp, blur, sharp, tack sharp, etc.
sometimes even worse, sometimes better
hitting the focus buttong multiple times on target didn't alter anything
livewview MF at 10x or liveview contrast AF was TS,TS,TS,TS,TS,TS,TS
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