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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 31 Jan 2006 (Tuesday) 18:18
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How are EF lenses calibrated?

 
JK
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Jan 31, 2006 18:18 |  #1

I was just wondering: when you send a "bad copy" of a lens to Canon to have it calibrated/adjusted, what's the actual process that Canon performs to do this?

Do they physically open the lens (tinker with screws to adjust) or is the adjustment performed electronically via the lens mount contacts? If so, would it be possible for a few keen amateur electronics tinkering geniuses to build a home-brew lens calibration unit?

I think it'd be awesome to have the ability to test and adjust your lenses at home! :D


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DocFrankenstein
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Jan 31, 2006 18:21 |  #2

I think they just keep them in the warehouse for a week, charge you and send it back.

You can do the same thing at home. Just put it in a closet for 2 weeks and then imagine it came from canon when you find it.


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JK
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Jan 31, 2006 18:27 as a reply to  @ DocFrankenstein's post |  #3

DocFrankenstein wrote:
I think they just keep them in the warehouse for a week, charge you and send it back.

You can do the same thing at home. Just put it in a closet for 2 weeks and then imagine it came from canon when you find it.

Lol! Had a bad experience, huh?
Well, they actually fixed the back-focus problem my 70-200 had (though it was the second time around I'd sent it to them!) so they must do something!

Are there any Canon reps/techs on these boards that could shed some light on this subject?


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Rigrider
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Jan 31, 2006 18:44 as a reply to  @ DocFrankenstein's post |  #4

DocFrankenstein wrote:
I think they just keep them in the warehouse for a week, charge you and send it back.

You can do the same thing at home. Just put it in a closet for 2 weeks and then imagine it came from canon when you find it.

GREATEST POST EVER!!!!!!!!!!!!!!!

I've never even thought about sending a lense back, but MAN that was funny!!!!

L8r,


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tessina
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Jan 31, 2006 20:16 |  #5

actually,having worked in an RMA inventory department for a major computer manufacturer before....it isn't that funny when you realize sometimes that is indeed precisely what they do when you send in your 'problematic' products....:(:(


Tess ;)
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ron ­ chappel
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Jan 31, 2006 21:27 |  #6

Most are calibrated by hooking them up to special software.
There is a member of this forum that services camera gear-he says that some like the EF50/1.8 are calibrated by joining or disconnecting certain solder connections on the circuit board




  
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ddelallata
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Jan 31, 2006 23:48 |  #7

I got a copy of a 24-70L that front-focused at the wide end, but I just returned it to the retailer for an exchange. I didn't want to go through the hassle of sending it in to Canon.


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Jon
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Feb 02, 2006 14:38 as a reply to  @ DocFrankenstein's post |  #8

DocFrankenstein wrote:
I think they just keep them in the warehouse for a week, charge you and send it back.

You can do the same thing at home. Just put it in a closet for 2 weeks and then imagine it came from canon when you find it.

Another satisfied customer of Canon Canada!


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Ross ­ McT.
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Feb 02, 2006 17:50 as a reply to  @ Jon's post |  #9

Jon wrote:
Another satisfied customer of Canon Canada!

Whats so bad about Canon Canada? (I havent delt with them)

The fact that they have a service center in Calgary (western Canada) was a selling factor over the Nikons (toronto area)

(on a side note, my brother sent a nikon 8800 to the nikon guys out east for a quote. 3.5 weeks passed before an answer was heard from them. They mail the quote to you... snail mail... in this day and age...:evil: I'm glad im not without my camera)


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TheSteveMadden
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Feb 02, 2006 20:56 |  #10

Canon's European CPS site FAQ has a good overview of the calibration steps for bodies and lenses. From what I gather, the calibration is all done in software once any mechanical reasons are ruled out.

http://www.cps.canon-europe.com/kb/detail.j​sp?faqId=1131 (external link)


Steve
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Jon
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Feb 03, 2006 09:20 as a reply to  @ Ross McT.'s post |  #11

Ross McTavish wrote:
Whats so bad about Canon Canada? (I havent delt with them)

The fact that they have a service center in Calgary (western Canada) was a selling factor over the Nikons (toronto area)

(on a side note, my brother sent a nikon 8800 to the nikon guys out east for a quote. 3.5 weeks passed before an answer was heard from them. They mail the quote to you... snail mail... in this day and age...:evil: I'm glad im not without my camera)

Canadian (and UK) users have repeatedly posted about long delays in getting their gear back, gear returned unrepaired, or gear lost. In contrast, the usual US repair seems to be around a week, if parts are available.


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ronmayhew
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Feb 03, 2006 15:15 as a reply to  @ DocFrankenstein's post |  #12

DocFrankenstein wrote:
I think they just keep them in the warehouse for a week, charge you and send it back.

You can do the same thing at home. Just put it in a closet for 2 weeks and then imagine it came from canon when you find it.

RFLMAO....
That was a riot!

I just got the email from Canon in New Jersey! that they shipped my 24-70 back yesterday.
I should have it on Monday.
I've got some before test shots. I'll share them and the after test shots when I get it back.

I'm looking forward to seeing the results.


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tough_dog
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Feb 03, 2006 17:02 |  #13

Received my new front-focusing 24-105 back from Irvine yesterday shipped 2-day FedEx. Total turnaround was 2 weeks. Lens now autofocuses with center of DOF almost perfectly positioned (very slightly backfocused). Photos are much improved and are now actually sharper than my 17-85 when both are wide open (with 24-105 a stop faster at the long end). The 20D and kit 17-85 arrived last August, also with a front-focus error. They went to Irvine and also came back in 2 weeks with much improved focus and sharpness. So, it appears that the Irvine center does properly calibrate lenses in a timely manner. It seems that Canon could possibly save some money and customer frustration is they would just carefully check each lens and calibrate if needed before selling them.


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::John::
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Feb 03, 2006 17:10 |  #14

Great link, Steve. It is interesting to read that they use a standard tool lens to calibrate bodies - and that the tool lens is a 50mm f/1.8

yay for the nifty fifty!




  
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mrclark321
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Feb 03, 2006 17:17 |  #15

I sent my 70-200f/2.8 to Canon Canada and they did an excellent job( Toronto )
I would not think twice about sending my gear there again!!

Dan


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How are EF lenses calibrated?
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