Does anybody have their 24-70L adjusted to either a 1D3 or 1Ds3 by using Micro Adjustments?

I am having a hard time getting it right (1Ds3).

For example, to get the most outer AF points working I have to use a +9 adjustment. Trouble is that my center AF point isn't sharp anymore between 50mm-70mm when I use +9. When I use an adjustment of +4, the center AF point over the entire focal range seems OK. But in this case the most outer AF points in the 24mm-35mm range aren't working under f/4.

I am looking for an average that will make both my center and outer AF points work properly.

Any ideas or tips how to get there?

Thanks

Take it to Canon rep to calibrate it. Itīs free as long you have warrant.

I have similar prob with my 35L.

PasiM wrote:
Take it to Canon rep to calibrate it. Itīs free as long you have warrant.

Yes, no doubt, having a warrant may help

When this happens it's probably because either the camera or the lens, or both, are out of whack. I'd send it in. I had mine do exactly this, and my 1Ds3 is in the shoppe as we speak.

Search spherical field of focus.

My 24-70/2.8L is the best performer with the 1D Mark III and 1Ds Mark III...no any problem as i know, i shoot f/2.8 most the time, and no problem with any AF points....

skid00skid00 wrote:
Search spherical field of focus.

While true, and while only very very few lenses are planar field, the vast majority of lenses are sufficiently planar field so that this doesn't come up. After all, the AF sensor points are neatly packed around the center of the frame.

My 1Ds3 is OK. All my other lenses (including the 35L ) are working perfectly. So the 24-70L is probably out of wack. I will have it calibrated by Canon Service. Must be the third time already though. But maybe the tech calibrated my 24-70L to my previous 1Ds3 (which was a dud). I shall ask him about that. If so, the solution seems obvious. Thanks all

stanj wrote:
skid00skid00 wrote:
Search spherical field of focus.

While true, and while only very very few lenses are planar field, the vast majority of lenses are sufficiently planar field so that this doesn't come up. After all, the AF sensor points are neatly packed around the center of the frame.

While I agree with you, I still find the 24-70L "walks away" pretty quickly when leaving the center. More so than any other lens I own. When I use a MA of +4, all of the center AF points work good at f/2.8 (from 24mm to 70mm). But under 50mm, the most outer AF points only give good results at appr. f/4 and smaller.

FWIW After contacting Canon Service (just now) I was told my 24-70L was calibrated to my old 1Ds3. So they are going at it again

Damn I thought they calibrated to standards rather than this this camera, that camera rubbish

Dawei Ye wrote:
Damn I thought they calibrated to standards rather than this this camera, that camera rubbish

I wish they did... Would have saved me another drive and waiting time

But I think they didn't know what to do anymore with my previous 1Ds3... So, I assume, that as a last resort, they tried calibrating the lens to my cam.

Dawei Ye wrote:
Damn I thought they calibrated to standards rather than this this camera, that camera rubbish

They do calibrate to standards aka "within factory tolerances". They then further calibrate a lens to "best possible focus" with a particular body.

Daan B -- in what way was your previous 1ds III a dud? Just prepping to buy one and want to know what to look out for. Thanks,

I'm surprised that any zoom has the edge to edge IQ throughout the zoom range to meet the 1Ds MK III 21 resolution.

httivals wrote:
Daan B -- in what way was your previous 1ds III a dud? Just prepping to buy one and want to know what to look out for. Thanks,

Do you have a minute... (or PM me). In a nutshell... AF was erratic and randomly off on all 19 AF points. Sometimes focus was spot on, the next moment it was way off under the same circumstances. As if the individual AF sensors were switched on and off during shooting. Unworkable. Calibration didn't help either... After three times trying Canon gave up and got me a new one that functions fine.

Daan B wrote:
FWIW After contacting Canon Service (just now) I was told my 24-70L was calibrated to my old 1Ds3. So they are going at it again




How long are they turning it around?

I guess I still disagree:

	http://www.flickr.com/photos/8927203@N02/2736337103/sizes/o/

	http://www.flickr.com/photos/8927203@N02/2147911186/sizes/o/