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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Aug 2013 (Friday) 10:54
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Requesting calibration data from lens manufacturers

 
Sens0r
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Aug 23, 2013 10:54 |  #1

This is just an idea that crossed my mind..

I work in military/business aviation industry, specifically in testing lights used in aircraft manufacturing. We keep records of every test procedure of each unit for 10 years in case a customer requests them (i.e the government, or business aircraft manufacturers).

I was thinking, since many of us wonder how good their "copy" of a lens is, why not contact the lens manufacturer and request the calibration/testing data for that copy based on its serial number?

Did anyone try this before?


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gjl711
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Aug 23, 2013 11:05 |  #2

Um.. This is why hammers cost $800 and toilet seats $1000. I'd be really surprised if any records are generated at all or even if every lens is final tested.


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caoko
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Aug 23, 2013 11:43 |  #3

what type of calibration data?




  
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amfoto1
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Aug 23, 2013 12:00 |  #4

If each lens were rigourously tested and supplied with that sort of data, they'd cost 3X as much or more!

If you want, you can do a lot of your own testing...

Read the article at http://www.lensrentals​.com …010/11/how-to-test-a-lens (external link)

Then look into http://www.dxo.com/int​l (external link) and their lens testing at http://www.dxomark.com …enses/Camera-Lens-Ratings (external link). They also have camera/sensor testing at http://www.dxomark.com …ras/Camera-Sensor-Ratings (external link)

You can make yourself crazy in search of "perfect" optics (hint: there's no such thing).

Me, I'll just go shoot with my gear and learn what it can do. Crunching the numbers often doesn't really tell us all that much about how a lens will perform out in the real world. Sure, I look at the numbers when I'm considering a purchase, but I take them with a grain of salt, don't put all that much weight on them. Sometimes it's the "flaws" of a lens that make it unusual and wonderful.


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Rafromak
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Aug 23, 2013 14:17 |  #5

gjl711 wrote in post #16233466 (external link)
Um.. This is why hammers cost $800 and toilet seats $1000. I'd be really surprised if any records are generated at all or even if every lens is final tested.

Don't be silly:D While I do agree that the existing calibration and testing of lenses and cameras is sufficient for us "picture takers," all parts and equipment used for military and commercial aircraft have to pass strict guidelines, not only for safety reasons, but also because the tremendously expensive liabilities involved.


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drive_75
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Aug 23, 2013 15:07 |  #6

Rafromak wrote in post #16233956 (external link)
Don't be silly:D While I do agree that the existing calibration and testing of lenses and cameras is sufficient for us "picture takers," all parts and equipment used for military and commercial aircraft have to pass strict guidelines, not only for safety reasons, but also because the tremendously expensive liabilities involved.

Years ago, I worked for a company that buy a decoder for $1000, tested to make sure it meet the military temp and sensitivity spec, repackage in the military enclosure and sell for $9000. This is true. All units passed but just need to verify and prove and then provide the test data.




  
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gjl711
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Aug 23, 2013 15:41 |  #7

Rafromak wrote in post #16233956 (external link)
Don't be silly:D While I do agree that the existing calibration and testing of lenses and cameras is sufficient for us "picture takers," all parts and equipment used for military and commercial aircraft have to pass strict guidelines, not only for safety reasons, but also because the tremendously expensive liabilities involved.

Yes, I know, I have worked on gov contracts before. The amount of record keeping is staggering and many times redundant.


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Rafromak
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Aug 23, 2013 16:02 |  #8

drive_75 wrote in post #16234068 (external link)
Years ago, I worked for a company that buy a decoder for $1000, tested to make sure it meet the military temp and sensitivity spec, repackage in the military enclosure and sell for $9000. This is true. All units passed but just need to verify and prove and then provide the test data.

Yes, and the "proving" part is expensive because your company assumes the possible liabilities. For example, if a company builds an aircraft fuel pump and it is found that the aircraft crashed because the pump malfunctioned, the pump manufacturer will be paying out of his nose in court. Another example: it's found that substandard aircraft engine-mount bolts were used and the engine separated from the aircraft frame...

See my points?


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Fernando
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Aug 23, 2013 16:35 |  #9

We issue Certs of Conformance and keep records for 10 years. Yes, we have to due to some of our certifications and Government requirements.

I wonder if Canon's Cal Lab is ISO Certified?


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Requesting calibration data from lens manufacturers
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