p.1 #1 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
1D-MarkIII - Front/Back Focus fine Adjustment ? What is this ?
Can someone elaborate on this ?
Feb 22, 2007 at 02:42 AM
drisley Offline • • • [X]
p.1 #2 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
It allows you to adjust your camera if it's back or front focusing! Pretty cool.
You can do it on a global setting, or on a per lens basis. So, say your 16-35L is backfocusing, you can calibrate it yourself, in camera, and each time you attach that lens, the 1D MkIII will remember the setting.
p.1 #3 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Yep. There are some caveats such as the camera can't read a lens' serial number, so it'll treat all 16-35's the same, for example, even if one focuses properly while the other has front focusing issues.
Check out Page 21 of the White Paper for more info.
p.1 #4 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Ariel Bravy wrote:
Yep. There are some caveats such as the camera can't read a lens' serial number, so it'll treat all 16-35's the same, for example, even if one focuses properly while the other has front focusing issues.
Check out Page 21 of the White Paper for more info.
p.1 #9 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Jeez, now we'll get endless posts like:
"I've adjusted my 1dIII focussing on my 70-200L IS, but my pictures are still out of focus. Am I doing something wrong or do I send it back to Canon for recalibration?"....
p.1 #10 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
bent-ove wrote:
maybe, as a wild guess, a future firmware upgrade can read lens' serial numbers if they figure a way to read/store it......?
hmm, if that's the case, the serial number would have been somehow programmed into the lens, rather than simply stamped onto it. I doubt they've been doing that all along...
roli_bark wrote:
Does this mean an end to our Back/Front focus troubles, and endless consumer reports on sending the Camera/Lens for re-calibration ?
Wow, I just wonder when this feature will be available in the ProSumer line ?
Let's hope so! It seems like an interesting way of dealing with a problem without actually solving it. Nevertheless, let's hope this feature trickles down into the consumer line. It'll be great for both Canon and for the consumer!
p.1 #11 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Mike Driscoll wrote:
Jeez, now we'll get endless posts like:
"I've adjusted my 1dIII focussing on my 70-200L IS, but my pictures are still out of focus. Am I doing something wrong or do I send it back to Canon for recalibration?"....
heh, I know you mean this somewhat tongue-in-cheek, but one would hope that a person who plonks down enough cash to pick up that kind of gear would have enough photographic background to know the basics. Often times (but not always), those sorts of questions are brought up by relative newbies whose technique is not yet sound and would rather blame their gear than themselves.
p.1 #12 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Ariel Bravy wrote:
It seems like an interesting way of dealing with a problem without actually solving it.
Is this a feature or an admission of poor manufacturing tolerances? Canon may have just found a way to solve what must be the majority of their service requests.
I wonder if this feature is how Canon calibrates AF when you send the body to them, or if it's separate from a more high-precision tool they use at the centres.
p.1 #13 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Mike Driscoll wrote:
Jeez, now we'll get endless posts like:
"I've adjusted my 1dIII focussing on my 70-200L IS, but my pictures are still out of focus. Am I doing something wrong or do I send it back to Canon for recalibration?"....
I sometimes wonder how NEGATIVE an attitude can be ...
Hey - life is short, enjoy good news while you can ...
p.1 #15 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
I don't think Canon encodes the serial number in to the lens firmware, they haven't really had a reason to up until now. They would have likely put it in the EXIF data all long had it been the case, and why would they not have used it in this system were it available? Perhaps a future addition to the EOS line...
p.1 #16 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
I wonder which was the greater motivating factor for this feature? End user requests or their own service technicians?
If it works it will certainly eliminate a lot of service calls. Personally, it's the most common reason for me to take gear to Canon. I'll gladly do it myself any time, any place.
p.1 #17 · 1D-MarkIII - Front/Back Focus Adjust ? What is this ?
Sounds like a great feature. You should never need it, of course, but it would have let me keep my 1D2 for an extra 8 weeks instead of letting Canon have it. Yes, my 1D2 had a back focus problem.
Is this a feature or an admission of poor manufacturing tolerances? Canon may have just found a way to solve what must be the majority of their service requests.