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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 07 Aug 2011 (Sunday) 12:58
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Details of lens focus adjustment on on bodies without MF Adjustment

 
GAJoe
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Aug 07, 2011 12:58 |  #1

Just curious and lookin' to learn. If the body (60D in my case) does not have the MFA feature how do you know if you need it done? Is it just for primes and not zooms? How is it done?
Thanks,
Joe


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Frugal
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Aug 07, 2011 18:55 |  #2

Do a search on MA or MFA if you must, but it's pointless when you can't do anything about it. Canon should have MFA on all their bodies


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absplastic
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Aug 07, 2011 19:31 |  #3

Frugal wrote in post #12893693 (external link)
Do a search on MA or MFA if you must, but it's pointless when you can't do anything about it. Canon should have MFA on all their bodies

I think possibly the OP is asking about how lens calibration is done, for when MFA is not available or the correct solution? I suspect it differs from lens to lens, but there must be some element(s) in every lens that can be moved front to back by rotating them and then locking in place, right? It would not surprise me at all if Canon techs had separate detailed instructions for each lens model and that the process is pretty invasive and requiring specialized spanners.


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GAJoe
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Aug 07, 2011 20:44 |  #4

Frugal,
My searches only yield how to do it on a body that has the feature or that it isn't possible on 60D's......
I was wanting to know how to recognise the problem. Then do you contact Canon and set up a service to correct it? Or just send the body and lens in with a note? If it's found when your lens first arrives should you return the lens and try another to confirm ? Is sending in for adjustment only practical with a prime lens? (I suspect)
This you-tube and the replies stirred my curiosity:
http://www.youtube.com​/watch?v=c_YlCNEgeIw (external link)

absplastic,
I hope to get a 70-300L some day and just hope that it will be as sharp as yours is on my 60D. I've been admiring your shots.
Thanks! Sorry I wasn't clear.
Joe


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pulsar123
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Aug 07, 2011 23:46 |  #5

To check if you need it: google for "front" or "back focus test". There are many different methods, from simplest hand-held shots of a series of batteries, to those involving PC software.

If you discover you need it: it could be either the lens, or the camera, or often both at fault. The most reliable (and expensive) solution is to send all the cameras and lenses you own to a service center, for cross-calibration. Or get a camera with MA feature (like 50D), but be aware that only prime lenses behave will with MA; zooms often need very different MA at different FL; then SC lens calibration is the only solution.

How exactly they do the calibration: I haven't seen any specific details, so it's probably commercial secret. Older cameras and lenses are probably calibrated purely mechanically, by shifting different elements; some newer ones most likely allow for some electronic (programmable chip) calibration.


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joeseph
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Aug 08, 2011 03:51 |  #6

some very useful reading here: http://www.lensrentals​.com …s-is-soft-and-other-myths (external link)


some fairly old canon camera stuff, canon lenses, Manfrotto "thingy", and an M5, also an M6 that has had a 720nm filter purchased for:
TF posting: here :-)

  
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GAJoe
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Aug 08, 2011 19:36 |  #7

joeseph wrote in post #12895497 (external link)
some very useful reading here: http://www.lensrentals​.com …s-is-soft-and-other-myths (external link)

bw!


Canon 7D Mk II, EF 100-400L MkII, EF 1.4X III, EF-S 18-135mm STM, 430 EX II flash, DCR-150, DCR-250, MANFROTTO 055XPROB w/ 322RC Grip

  
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Details of lens focus adjustment on on bodies without MF Adjustment
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