Canon 1DX ITR AF Feature

[Secretariat]

Forgive the ignorance but what is the ITR AF feature in the Canon 1DX all about?Is it true that if it is turned on,it slows down the auto-focusing of the camera a bit?And lastly,when is it best to use this feature and when is it better not to use it?
Thanks in advance.

[neuroanatomist]

It's face-detection with phase AF.  I find that it works pretty for tracking a person moving through a group.  I have a Servo setting for 'people/events' and I use iTR for that, but not for my wildlife/birds setting.  Note that for iTR to work, you've got to be in 61-point auto selection more for the AF point selection.

[Secretariat]

Thanks a lot for your reply.

[caruser]

It's face-detection with phase AF.  I find that it works pretty for tracking a person moving through a group.  I have a Servo setting for 'people/events' and I use iTR for that, but not for my wildlife/birds setting.  Note that for iTR to work, you've got to be in 61-point auto selection more for the AF point selection.

Is it ok to have only cross-type points selectable?

[neuroanatomist]

Yes.  Setting 'select cross type points' limits only what you can manually select.  With 4- or 8-pt expansion or 61-pt in Servo, when the camera is picking the AF point(s), it will use both cross- and line-type points.

[Viggo]

It's face-detection with phase AF.  I find that it works pretty for tracking a person moving through a group.  I have a Servo setting for 'people/events' and I use iTR for that, but not for my wildlife/birds setting.  Note that for iTR to work, you've got to be in 61-point auto selection more for the AF point selection.

Really? I thought iTR also worked with 4 and 8 expanded, at least the color tracking?

[caruser]

Yes.  Setting 'select cross type points' limits only what you can manually select.  With 4- or 8-pt expansion or 61-pt in Servo, when the camera is picking the AF point(s), it will use both cross- and line-type points.

Thanks for the confirmation, I got the 1DX only two weeks ago, and haven't had an opportunity to put all AF modes to a proper test yet.

PS: It was also some of your input that convinced me to get the 1DX, and what can I say, it's great, and I don't miss the 3MP from the 5D2!

[neuroanatomist]

Really? I thought iTR also worked with 4 and 8 expanded, at least the color tracking?

Nope - 61-pt auto and Zone AF only.  See p.95 of the manual.

[Viggo]

Really? I thought iTR also worked with 4 and 8 expanded, at least the color tracking?

Nope - 61-pt auto and Zone AF only.  See p.95 of the manual.

Wow... So I haven't even tried color-tracking at all? That is weird because with the 1dx and same settings as the 5d3 with 4 point expansion the 1dx tracks waaay better, and I'm not sure the 50 L benefits from the higher drive power from the bigger battery...

Does that mean I should turn it off if I never use zone and all 61?

[neuroanatomist]

Does that mean I should turn it off if I never use zone and all 61?

No need to turn it off, but if left on it's not doing anything for you...

[Viggo]

Does that mean I should turn it off if I never use zone and all 61?

No need to turn it off, but if left on it's not doing anything for you...

Thanks a lot! I was a bit surprised by this, lol. Oh well, the 1dx hardly ever misses anything  for me anyway