Stoffer wrote: PetKal wrote: Stoffer wrote:
Peter, I\'m pretty much clueless on iTR AF ... but the manual says that it works with either the 61-point automatic selection AF or Zone AF. It will track based on the initial AF point used, but AFAIK you can only select this initial point with the 61-point automatic AF not the Zone AF.
Nils, that is a puzzling part to me......because, fundamentally, Zone AF is just a small area auto AF point selection.......no target \"registration\" takes place with it.
I dont understand how Zone AF can work with iTR AF either.
Nils, this morning I finally set out to verify iTR AF effectiveness.
The camera/lens used: handheld 1DX + 500 II.
AF mode: Servo AF, center AF point with 61 pt. auto selection, iTR AF ON.
The results: On fly-by shots of the type below (a willow tree in the background), iTRF AF (center AF pt. + 61 Pt. auto selection) gives noticeably higher keeper rate than any other AF mode without iTR AF. Typical failure to focus on the target is a diversion to the background.
That is for a simple fly-by case. For head-on flight case I have not accumulated sufficient shot sample size in order to make any good conclusions yet, as such shot opportunities against a busy background are generally scarce.
Stoffer wrote: PetKal wrote: Stoffer wrote:
Peter, I\'m pretty much clueless on iTR AF ... but the manual says that it works with either the 61-point automatic selection AF or Zone AF. It will track based on the initial AF point used, but AFAIK you can only select this initial point with the 61-point automatic AF not the Zone AF.
Nils, that is a puzzling part to me......because, fundamentally, Zone AF is just a small area auto AF point selection.......no target \"registration\" takes place with it.
I dont understand how Zone AF can work with iTR AF either.
Nils, this morning I finally set out to verify iTR AF effectiveness.
The camera/lens used: handheld 1DX + 500 II.
AF mode: Servo AF, center AF point with 61 pt. auto selection, iTR AF ON.
The results: On fly-by shots of the type below (a willow tree in the background), iTRF AF (center AF pt. + 61 Pt. auto selection) gives noticeably higher keeper rate than any other AF mode without iTR AF. Typical failure to focus on the target is a diversion to the background.
That is for a simple fly-by case. For head-on flight case I have not accumulated sufficient shot sample size in order to make any good conclusions yet, as such shot opportunities against a busy background are generally scarce.
May 15, 2013 at 12:33 PM
Previous versions of PetKal's message #11555071 « Canon EOS 1DX AF Expanded focus »
... but the manual says that it works with either the 61-point automatic selection AF 
