Stoffer wrote:
I dont understand how Zone AF can work with iTR AF either.
It doesn't, it's only for fully Auto AF point selection.
Zone is quite different to 8 point expansion. In 8 point expansion the camera tries to use the point you have manually set, and if it encounters difficulties such as low contrast it will then switch to the assist points to try an acquire focus; they are essentially fall back points. In zone any one or more of those points in the zone can be called upon to acquires focus and it ti will try and focus the closest object. The auto point switching parameter is there to allow, if necessary the AF to switch to a new point faster than normal. Case 5 and 6 only work when you have either manual AF point with expansion (4 or 8), zone or Auto AF; it doesn't activate with spot, or single point AF.
PetKal wrote:
All of this what we've discussed and much more you could get from expert/pro websites such as Birds as Art and similar, where folks shoot real birds.
I wouldn't wanna lead you astray with my amateur, possibly mistaken, workarounds and old school pijun shootin' ideas
Exactly... We don't help each other out here on FM forums. We send you somewhere else to buy advice.
Pixel Perfect wrote:
It doesn't, it's only for fully Auto AF point selection.
Zone is quite different to 8 point expansion. In 8 point expansion the camera tries to use the point you have manually set, and if it encounters difficulties such as low contrast it will then switch to the assist points to try an acquire focus; they are essentially fall back points. In zone any one or more of those points in the zone can be called upon to acquires focus and it ti will try and focus the closest object. The auto point switching parameter is there to allow, if necessary the AF to switch to a new point faster than normal. Case 5 and 6 only work when you have either manual AF point with expansion (4 or 8), zone or Auto AF; it doesn't activate with spot, or single point AF....Show more →
Hi Pixel Perfect. Yes, I know the difference between Zone AF and 8 point expansion as I tried to explain it to the OP earlier in this thread.
My point was that the manual (not me!) states that you can use iTR AF with Zone AF. That didn't make sense to me - and apparently neither to you.
Maybe it is a misprint in the manual. Check page 95.
I've been using iTR AF for youth ice hockey with pretty good success. My set-up is to normally use single point with 8 surrounding expansion points for more precise control, but have set up Auto AF point selection to activate when I keep the second of the front function buttons pressed down. Therefore, I can switch between the two very quickly. One thing though, I've found if there isn't clear definition of the subject (significant brightness/colour difference compared to the background), the auto selected points have a tendency to drift away to other areas on the subject. For example, if I was starting off with the initial AF point placed on the subject's head, eventually the auto selected points might be farther down the body. With large subjects with potentially low contrast detail, such as horses, you'll want to test just how well this works. I have been fairly impressed though how well the iTR setting seems to hold onto the subject when there is a lot of cross traffic momentarily obstructing the view.
FWIW, That last link works fine for me on a macbook pro using the Chrome browser.
You guys need to separate out this discussion between one shot and servo tracking as that is adding confusion.
In servo, if you use all the points, you should start with the subject in the central point. ITR helps by using the colour metering sensor to help keep the tracking on areas of colour (brown bird, blue sky, stick with the brown bird). It isn't clear to me why one would want to use a zone in servo mode since, one an object is being tracked, you can just recompose.
