How many of your lenses required af adjustments? I just found my 35L need some and did on mk III, checked all other - all fine. Does it sound to you that lens need pro service as well? It is 2 y.old and I never found this issue on 5D I recently sold.
5 out of 12 possible combinations of 9 lenses and a 1.4X extender. Out of those 5, 2 needed only slight tweaking (+3 and +4), 3 needed more than +5 MA and none are in the negative MA territory. I'm seeing an improvement over the same lenses on my 5D in all cases except the 35L (+8 but perfect on my 5D). There have been quite a few people who've had issues with that lens on the Mk III so I wouldn't send it in for service; it's one of the reasons I think it'll be up for replacement sooner rather than later. Had expected it at Photokina instead of the 24L Mk II.
Emile Gregoire wrote:
5 out of 12 possible combinations of 9 lenses and a 1.4X extender. Out of those 5, 2 needed only slight tweaking (+3 and +4), 3 needed more than +5 MA and none are in the negative MA territory. I'm seeing an improvement over the same lenses on my 5D in all cases except the 35L (+8 but perfect on my 5D). There have been quite a few people who've had issues with that lens on the Mk III so I wouldn't send it in for service; it's one of the reasons I think it'll be up for replacement sooner rather than later. Had expected it at Photokina instead of the 24L Mk II....Show more →
Correct, I did almoust max adjustment for 35L and still seem not perfect.
santa wrote:
what method did you use to test your lenses? some methods in common use are better than others.
I do shots wide open, for lenses like 35L focusing in F1.4 should be very narrow. So I am using some letters or something at about min focusing distance and checking how it gets changed while adjusting.
There is no set rule as to whether a lens will need front or back micro adjustment on a mkIII. The calibration can be off on both the mkIII focus points, and on any or all of the lenses you use. When I took delivery of my mkIII it was front focusing at +10. One of my lenses needed +17 MA to come into focus. After a trip to Canon they recalibrated the camera and and that same lens requires +7 MA now. Out of the ten different lenses I own the MA range is from +7 to -3. They all work well and focus nicely.
I agree. You may also find a lens needs +10 on one model and -5 with another. At least Canon and Nikon are providing the AF fine tuning adjustement in all but the low-end bodies now.
EB-1 wrote:
I agree. You may also find a lens needs +10 on one model and -5 with another. At least Canon and Nikon are providing the AF fine tuning adjustement in all but the low-end bodies now.
EBH
Doesn't the 50D have this?
I'm happy they've started it on the new 5d and I think the 50D. In reality, a lot of "not so sharp copies" i'm sure could be solved with a few clicks either way.
Breitling65 wrote:
Correct, I did almoust max adjustment for 35L and still seem not perfect.
I tried the MA process on 3 of my lenses and couldn't get it right -- very frustrating! So I called Canon service, sent them some files, and they told me my camera was front-focusing and needed to be serviced. No WONDER I couldn't get the MA to work right... So, I drove it to Irvine last week and will pick it up Tuesday (they're closed Monday for Columbus Day!). I'll report back what I find, but I was not happy to see this problem. My 1dII was much better, but I'm confident that they'll fix this and get me where I need to be.
I'm mentioning this because if you can't get it to be "perfect," maybe, like mine, your camera needs an adjustment...
That's a good test, but from what I see it can only indicate that the lens is in focus somewhere within its depth of field. I prefer to know that my lenses are focusing at 1/3 back in the DOF which has to be done by other methods.
About this whole Micro adjustment thing--- I think this is time consuming. What if someone may create a small program accessible via USB port plugged in to a computer.... the program runs the test\calibration comparing lens' sharpness vs blurriest against its settings on a chart.
Much like when you calibrate your HP printer .. all you need to do choose the straightiest line it can produce... then enter those values on your camera... -- no need to compare pictures the software does it for you.
hope someone here may come up with that...using Canon's developer's Kit.
Or maybe Canon should release some utility or as part of an update to their EOS Utility.
It would be great if they made it so that the 40D can do these micro adjustments.
4 lenses, 16-35, 50 1.2, 135 2.0 and 70-200 2.8 IS all bought new from a dealer that does not restock returned lenses and after testing I needed zero microadjustments on any of the lenses with the MKIII.
jchin wrote:
Or maybe Canon should release some utility or as part of an update to their EOS Utility.
It would be great if they made it so that the 40D can do these micro adjustments.
I bet Canon has that on their factory.... how do u think they calibrate EOS bodies and lenses?....
jchin wrote:
Or maybe Canon should release some utility or as part of an update to their EOS Utility.
It would be great if they made it so that the 40D can do these micro adjustments.
I bet Canon has that on their factory.... how do u think they calibrate EOS bodies and lenses?....
