Gear Talk > EOS Bodies - For Stills
1DX - Ai Servo Issue - Low light focus failure! Final Update 05/09/12
Mt Spokane Photography:
--- Quote from: Sycotek on July 08, 2012, 10:20:26 PM ---Further testing:
I don’t think the 100K rgb sensor is quite as refined as it should be.
I tested this theory over lunch with a red, blue, brown, grey dark box (so to speak) – focused on the canon black cap using the canon logo as target:
I was having issues one shot - locking on grey objects at -2ev (which is sort of expected) adding in a white and red object made it easier but it still wasn't a cakewalk do to the af points not lighting up and not being able to see where the af point was in correlation to the target. I had to use a tripod and a torch to make sure I had the af point on the object... otherwise i had to keep moving the af point back and forth just to be able to see where the point was...
--- End quote ---
I'd exchange the camera myself. There are many testers and users who haven't reported a issue like this. As for the unlighted AF points, that is a big issue, part of the reason I returned my 5D MK III and bought a 1D MK IV.
BTW You can light up the points by pressing the AF point selection button, but its not a elegant work around. You certainly do not need a torch.
neuroanatomist:
Let us know what Canon says.
Oddly, in the 6 use cases designed to make setting up the AI Servo options, 'still life' isn't one of them. Just wondering if that's the best test scenario for an AI Servo issue?
Sycotek:
--- Quote from: neuroanatomist on July 08, 2012, 10:34:52 PM ---Let us know what Canon says.
Oddly, in the 6 use cases designed to make setting up the AI Servo options, 'still life' isn't one of them. Just wondering if that's the best test scenario for an AI Servo issue?
--- End quote ---
I actually only started to look into this as i couldn't lock onto my cousins head moving around the house... definitely wasn't still - i just needed a controlled environment for testing however so this the above is what I came up with.
Regarding the need for a torch - i found when i lit up all the af points i then couldn't see the target lol :P but that af selector light up all points is something I have done since my 7D :) Agreed not elegant but it works.
AlbertaCanonShooter:
I've been having focus issues with the 1D X in both AI Servo and one shot.
I also had similar experiences in full daylight as the OP with the camera refusing to focus at all. In my case, I was using a 70-200 2.8IS II L. A few times when I would point the camera to an object at infinity. The focus would rack to the nearest distance and stop. This was in sing;e shot AF. It wouldn't hunt - it would just go totally out of focus. Releasing and pressing AF wouldn't do anything - the camera would not try to focus again. The only ay I could get it to acquire focus was to manually focus the lens (to get it at least somewhat sharp), then the AF would begin working again.
Below is one example of the camera missing focus from a wedding I shot this past weekend. An assistant was holding a 600EX-RT behind the couple for backlighting. This was in one shot mode with single AF point and four expansion points. This is a screen grab from the file in DPP so the active (and helper) focus point can be seen. As you can see, there is lots of contrast for the main focus point, as well as good contrast under the four expansion points yet it totally missed.
Here's the OOF example from the wedding:
neuroanatomist:
Although I'm having a problem with the 1D X not storing AFMA settings, AI Servo focusing in low light seems fine. ISO 4000 shot, screenshot of 50% view in DPP.
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