The latest report on 1D Mark III AF issues

CyberDyneSystems wrote in post #3532560
Thanks Lisa,. posting them here was not only to prove the point, but against my own better judgment I was hoping people might stop saying I don't know how to use the camera if I showed that I can actually take pics of BIF

I know what your thinking,.. "dreamer get your head out of the clouds.. "

I don't think anyone would ever say you can not use any camera. Great shots.

I have not had time to shoot much with Mark III, but I did some tests with AI Servo for runners, bikers and cars. It is clear that Servo focuses very fast and obtains a focus lock 99% of the time, but its the AI part which seems to fail detecting the movement direction, as if movement detection engine had pauses/hiccups. I suspect that this is purely a software problem (lens communication, command timing), or a problem in the motherboard dual CPU bus/driver (which is software too, albeit possibly on a chip). The actual focusing hardware works great and is very accurate, much better than Mark II. For me that is the thing I paid for and got, especially low light AF reliability. If people have cameras that fail to lock focus accurately each time with one shot (not AI) then I say that they'll need to get their hardware fixed. About AI Servo we need to wait for Canon to comment.

sergi2 wrote in post #3532794
about C Fn in RGalbraith site (new)
http://www.robgalbrait​h.com …_page.asp?cid=7​-8741-9036

Thank you.

Pekka wrote in post #3532828
I don't think anyone would ever say you can not use any camera. Great shots.

I have not had time to shoot much with Mark III, but I did some tests with AI Servo for runners, bikers and cars. It is clear that Servo focuses very fast and obtains a focus lock 99% of the time, but its the AI part which seems to fail detecting the movement direction, as if movement detection engine had pauses/hiccups. I suspect that this is purely a software problem (lens communication, command timing), or a problem in the motherboard dual CPU bus/driver (which is software too, albeit possibly on a chip). The actual focusing hardware works great and is very accurate, much better than Mark II. For me that is the thing I paid for and got, especially low light AF reliability. If people have cameras that fail to lock focus accurately each time with one shot (not AI) then I say that they'll need to get their hardware fixed. About AI Servo we need to wait for Canon to comment.

Pekka, just a clarification, please. Are you saying that even though the subject is moving, the AIServo pauses and doesn't continue to follow the subject? Or did you mean that AIServo is not focusing continuously like the Mark II does (which keeps shifting the focus back and forth even when the subject has stopped moving)?

PacAce wrote in post #3533143
Pekka, just a clarification, please. Are you saying that even though the subject is moving, the AIServo pauses and doesn't continue to follow the subject? Or did you mean that AIServo is not focusing continuously like the Mark II does (which keeps shifting the focus back and forth even when the subject has stopped moving)?

With still subjects Mark III AI Servo is doing what is should do: seek for moving subject. That is why it is normal that it hunts (in very small area) all the time time when focused to a still subject. Always use one shot focus for still subjects, or tap AI just once to lock it.

With moving subject my impression is that the AI does this:
it follows the subject, pauses for an instant (the subject goes on), then hunts the subject again, follows the subject, pauses for an instant (the subject goes on), then hunts the subject again....
It does this with fast moving subjects moving towards you. In my view it works much better when subject is moving away, or subject is moving sideways/diagonally. I have had only about one hour to test the Servo in bright sun with runners and bikers, so I am a novice with it. But my impression is that the servo engine brain has "hiccups" when the speed of subject is relatively fast and it moves towards you.

OK, got it. Thanks for the clarification, Pekka.

CyberDyneSystems wrote in post #3532560
I was hoping people might stop assuming that I don't know how to use the camera if I showed that I can actually take pics of BIF

Ahem...ahem.

Canon Support Center UK, says...
http://forums.dpreview​.com …orum=1032&threa​d=23978342

sergi2 wrote in post #3533558
Canon Support Center UK, says...
http://forums.dpreview​.com …orum=1032&threa​d=23978342

That stuff sounds very unconvincing...
Poorly written, both English style and technically.
Some of it appears outright bizare.

If Canon actually said this;

Then we are all in a world of hurt!

Fortunately none of us are so gullible as to believe it simply because it was posted on DPR, .. quite the contrary

I think I'll let the rest of the forum get a good laugh at this one before deleting it as total bull...

i am sorry but if this little gem was infact written by Canon UK, i have a feeling that Canon will not be in business for much longer. i have never seen such BS in my life and i hope that nobody that bought the mkIII actually takes their advice. seriously, people are waiting for a serious response and not something that was written by a 5 year old kid from the UK.

I think when Chuck Westfall sees that text the phone lines will get hot.

Oh man if that's really from CanonUK someone will get the smack down!

Somehow I doubt it's "authenticity" though

bmx43 wrote in post #3532613
once canon confirms a problem, and they will, i plan to have a BBQ at my house for all of the people who continue to tell me that because there is no problem with their camera, there is no problem with my camera. it must be the operator.

the menu will consist of one item: Crow....how would you like yours cooked?

And this helps us solve the problem how?

KAC

Sure, turn up sharpness and that will improve AIservo issues. See CDS, it IS user error. Lol. Next, the writer (a troll) will say one must use "Portrait" mode to get flower pictures in focus.


NOT!

Pekka wrote in post #3532828
I don't think anyone would ever say you can not use any camera. Great shots.

I have not had time to shoot much with Mark III, but I did some tests with AI Servo for runners, bikers and cars. It is clear that Servo focuses very fast and obtains a focus lock 99% of the time, but its the AI part which seems to fail detecting the movement direction, as if movement detection engine had pauses/hiccups. I suspect that this is purely a software problem (lens communication, command timing), or a problem in the motherboard dual CPU bus/driver (which is software too, albeit possibly on a chip). The actual focusing hardware works great and is very accurate, much better than Mark II. For me that is the thing I paid for and got, especially low light AF reliability. If people have cameras that fail to lock focus accurately each time with one shot (not AI) then I say that they'll need to get their hardware fixed. About AI Servo we need to wait for Canon to comment.

Good reasoning. I have had mine "hunt" in one-shot a few times in low light, but not nearly as much as the 20D.

KAC