July 18, 2018, 04:36:25 PM

Author Topic: Does CPS fix decentred lenses?  (Read 4987 times)

AlanF

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Does CPS fix decentred lenses?
« on: January 10, 2018, 05:04:36 PM »
One of my lenses appears decentred, with front focusing on one side and back focusing on the other. Does a Canon repair centre fix this type of problem? If so, would it best be done as part of a general service?
5D IV, 5DS R, 400mm DO II, 1.4xTC III, 2xTC III, EF 1.8 STM,  EF 24-105, 100-400 II, EF-S 15-85, Sigma 150-600mm C, EOS-M5 15-45, f/2 22, 11-22, Samyang 8mm f/2.8 fisheye: sold 7D II, EOS-M, Powershot G3 X,  Sigma 10-20, EF 300/2.8 II, 70-200/4 IS.

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Does CPS fix decentred lenses?
« on: January 10, 2018, 05:04:36 PM »

D.

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Re: Does CPS fix decentred lenses?
« Reply #1 on: January 10, 2018, 05:14:48 PM »
I have sent two lenses in that were decentered for Canon to repair. They did improve both lenses, but neither lens was completely fixed. After those experiences, I carefully check each lens when I buy them so I can return if necessary. Others may have different experiences.

Don Haines

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Re: Does CPS fix decentred lenses?
« Reply #2 on: January 10, 2018, 05:20:14 PM »
I have sent two lenses in that were decentered for Canon to repair. They did improve both lenses, but neither lens was completely fixed. After those experiences, I carefully check each lens when I buy them so I can return if necessary. Others may have different experiences.

I would have sent them back for round two of repair, with a detailed note and pictures to explain the problem, making sure to word things politely....  something like “ you have certainly improved it, but I still see the problem, is it possible to correct it further?” A little niceness goes a long way and sometimes inspires the tech to go that extra mile......
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jolyonralph

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Re: Does CPS fix decentred lenses?
« Reply #3 on: January 10, 2018, 07:29:08 PM »
My old 24-70 was fixed by them, and it came back fine. Now sold on as I have the 24-70 II
Jolyon Ralph

Cameras: 5DSR, A7RII, 5D III, EOS M6/M5/M3, Mavic Pro, DXO One.  Oh, and more lenses than I care to count.

AlanF

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Re: Does CPS fix decentred lenses?
« Reply #4 on: January 11, 2018, 03:15:38 AM »
Thanks for your replies. 
5D IV, 5DS R, 400mm DO II, 1.4xTC III, 2xTC III, EF 1.8 STM,  EF 24-105, 100-400 II, EF-S 15-85, Sigma 150-600mm C, EOS-M5 15-45, f/2 22, 11-22, Samyang 8mm f/2.8 fisheye: sold 7D II, EOS-M, Powershot G3 X,  Sigma 10-20, EF 300/2.8 II, 70-200/4 IS.

bholliman

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Re: Does CPS fix decentred lenses?
« Reply #5 on: January 11, 2018, 09:20:19 AM »
Canon did a good job repairing a decentered 100L Macro lens for me 3 years ago.  It was soft on the right side and came back perfect.  I sent a.detailed explanation of the problem and prints, I think this helped.
5DsR, EF Lenses: 35mm f/2IS, Tamron 85mm f/1.8 VC, 300mm f/2.8L II IS, 16-35mm f/4L IS, 24-70mm f/2.8LII, 70-200mm f/2.8LII
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privatebydesign

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Re: Does CPS fix decentred lenses?
« Reply #6 on: January 11, 2018, 09:47:15 AM »
Canon did a good job repairing a decentered 100L Macro lens for me 3 years ago.  It was soft on the right side and came back perfect.  I sent a.detailed explanation of the problem and prints, I think this helped.

It doesn’t. It goes on a bench lens test rig, if it meets specs it’s left alone if it doesn’t it is worked on.

I have sent very detailed explainations and test images that have been returned un-looked at, if the lens passes the bench test specs it gets returned. I had a long running issue with a 16-35 f2.8 that took several trips to get sorted out satisfactorily.
Too often we lose sight of the fact that photography is about capturing light, if we have the ability to take control of that light then we grow exponentially as photographers. More often than not the image is not about lens speed, sensor size, DR, MP's or AF, it is about the light.

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Re: Does CPS fix decentred lenses?
« Reply #6 on: January 11, 2018, 09:47:15 AM »

neuroanatomist

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Re: Does CPS fix decentred lenses?
« Reply #7 on: January 11, 2018, 10:08:46 AM »
It doesn’t. It goes on a bench lens test rig, if it meets specs it’s left alone if it doesn’t it is worked on.

So, if you have a subtle problem the best path forward is to make it worse before you send it in.



 ;)
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bholliman

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Re: Does CPS fix decentred lenses?
« Reply #8 on: January 11, 2018, 11:29:53 AM »
Canon did a good job repairing a decentered 100L Macro lens for me 3 years ago.  It was soft on the right side and came back perfect.  I sent a.detailed explanation of the problem and prints, I think this helped.

It doesn’t. It goes on a bench lens test rig, if it meets specs it’s left alone if it doesn’t it is worked on.

I have sent very detailed explainations and test images that have been returned un-looked at, if the lens passes the bench test specs it gets returned. I had a long running issue with a 16-35 f2.8 that took several trips to get sorted out satisfactorily.

I must have gotten lucky and it was either out of spec or the Tech was unusually conscientious :)
5DsR, EF Lenses: 35mm f/2IS, Tamron 85mm f/1.8 VC, 300mm f/2.8L II IS, 16-35mm f/4L IS, 24-70mm f/2.8LII, 70-200mm f/2.8LII
M5, EF-M lenses: 22mm f/2, 18-150mm
https://www.flickr.com/photos/68928679@N05

AlanF

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Re: Does CPS fix decentred lenses?
« Reply #9 on: January 11, 2018, 11:33:03 AM »
Canon did a good job repairing a decentered 100L Macro lens for me 3 years ago.  It was soft on the right side and came back perfect.  I sent a.detailed explanation of the problem and prints, I think this helped.

It doesn’t. It goes on a bench lens test rig, if it meets specs it’s left alone if it doesn’t it is worked on.

I have sent very detailed explainations and test images that have been returned un-looked at, if the lens passes the bench test specs it gets returned. I had a long running issue with a 16-35 f2.8 that took several trips to get sorted out satisfactorily.

The tech was probably a CR member and recognised you.
5D IV, 5DS R, 400mm DO II, 1.4xTC III, 2xTC III, EF 1.8 STM,  EF 24-105, 100-400 II, EF-S 15-85, Sigma 150-600mm C, EOS-M5 15-45, f/2 22, 11-22, Samyang 8mm f/2.8 fisheye: sold 7D II, EOS-M, Powershot G3 X,  Sigma 10-20, EF 300/2.8 II, 70-200/4 IS.

AlanF

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Re: Does CPS fix decentred lenses?
« Reply #10 on: January 21, 2018, 04:21:18 AM »
Canon did a good job repairing a decentered 100L Macro lens for me 3 years ago.  It was soft on the right side and came back perfect.  I sent a.detailed explanation of the problem and prints, I think this helped.

It doesn’t. It goes on a bench lens test rig, if it meets specs it’s left alone if it doesn’t it is worked on.

I have sent very detailed explainations and test images that have been returned un-looked at, if the lens passes the bench test specs it gets returned. I had a long running issue with a 16-35 f2.8 that took several trips to get sorted out satisfactorily.

The tech was probably a CR member and recognised you.

The tech recognised me as well: just as you wrote, the lens passed the bench test, and they charged me for a service and replaced the lens mount seal, and didn't adjust the optics. The problem, I suppose, is that the specs from Canon and all the manufacturers are lower than we finickety individuals expect.
5D IV, 5DS R, 400mm DO II, 1.4xTC III, 2xTC III, EF 1.8 STM,  EF 24-105, 100-400 II, EF-S 15-85, Sigma 150-600mm C, EOS-M5 15-45, f/2 22, 11-22, Samyang 8mm f/2.8 fisheye: sold 7D II, EOS-M, Powershot G3 X,  Sigma 10-20, EF 300/2.8 II, 70-200/4 IS.

YuengLinger

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Re: Does CPS fix decentred lenses?
« Reply #11 on: January 21, 2018, 08:25:51 AM »
I've only had one disappointing experience with CPS, but it worked out for the best in the end.  I sent in an ef 35mm f/1.4L (I) that had, to my eyes, massive amounts of purple fringing even at f/5.6. 

"In spec," the tech said.

Fortunately it was under warranty and I only paid for shipping to them.

So I sold that 35mm and bought a Sigma 35mm Art, which I thought was better than the Canon, but still not satisfying.  (Skin tones and other colors just seemed flat, harsh.  Functioned fine, adequate AF, though no speed demon.)

And then the 35mm f/1.4L II came out, so out went the Sigma.  The Canon version II and I have been living happily together ever since.

All my other experiences, maybe seven or eight in the past five years, have been positive.  I've found their techs to be very open minded, especially by phone when they can work with the same gear I'm calling about as I describe an issue.

Best story:  Had a 24-70mm 2.8L (I) that had never been impressively sharp, but seemed okay.  When it got to be about seven years old, I thought the AF had fallen off a bit, so I sent it in.  Came back like a different lens, incredibly sharp and accurate.  Amazing the improvement.  But then I let my wife use it with a tripod.  Crash, smash, and cash (which went to the just released version II)!

Mt Spokane Photography

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Re: Does CPS fix decentred lenses?
« Reply #12 on: January 21, 2018, 01:36:51 PM »

jhpeterson

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Re: Does CPS fix decentred lenses?
« Reply #13 on: February 08, 2018, 10:00:26 AM »
So, if you have a subtle problem the best path forward is to make it worse before you send it in.



 ;)
That's much like what a friend does with his cameras. He buys the consumer level models and a multi-year protection plan, then uses them for his professional work. When they start to fail, usually just after the next model comes out, he sees that they need to be replaced. Unlike me, who tends to use the last generation pro-grade cameras, he always seems to have the latest stuff.
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Re: Does CPS fix decentred lenses?
« Reply #13 on: February 08, 2018, 10:00:26 AM »