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02-08-2010, 10:30 PM   #1
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Lens Failure Statistics

Statistics below shows that Pentax have the least amount of lens failure rates compared to other brands. cannon lenses have the most defects. You can read more at LensPlay - Lens defects

Canon lenses - 12012 with 907 defects
The probability of getting a good lens is 92 %
The probability of getting 5 Canon lenses in a row is 68 %

Sigma lenses - 2676 with 587 defects
The probability of getting a good lens is 78 %
The probability of getting 5 good Sigma lenses in a row is 29 %

Tamron lenses - 1323 with 203 defects
The probability of getting a good lens is 85 %
The probability of getting 5 good Tamron lenses in a row is 43 %

Tokina lenses - 436 with 70 defects
The probability of getting a good lens is 84 %
The probability of getting 5 good Tokina lenses in a row is 42 %

Nikon lenses - 2198 with 173 defects
The probability of getting a good lens is 92 %
The probability of getting 5 good Nikon lenses in a row is 66 %

Pentax lenses - 1239 with 86 defects
The probability of getting a good lens is 93 %
The probability of getting 5 good Pentax lenses in a row is 70 %

Minolta/Konica/Sony lenses - 591 with 60 defects
The probability of getting a good lens is 90 %
The probability of getting 5 good Minolta/Sony lenses in a row is 59 %

Other lenses - 865 with 92 defects
The probability of getting a good lens is 89 %
The probability of getting 5 good Other lenses in a row is 57 %

02-08-2010, 10:34 PM   #2
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Good try but no cigar.
If you broke the Pentax lenses down into SDM and non-SDM, I'm sure the failures would be disproportionally high statistically for the SDM lenses.
02-08-2010, 10:37 PM   #3
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QuoteOriginally posted by Damn Brit Quote
Good try but no cigar.
If you broke the Pentax lenses down into SDM and non-SDM, I'm sure the failures would be disproportionally high statistically for the SDM lenses.
Actually, the survey is about lenses defective upon purchase. "What we need to know is how many new lenses that you received in the last 5 years were defective when they arrived. Note this isn't a survey related to how many lenses have broken during use - that's another issue."
02-08-2010, 10:38 PM   #4
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They don't break it down into SDM and non SDM. The Statistics are generelized for every brand.

02-08-2010, 10:39 PM   #5
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QuoteOriginally posted by Alex00 Quote
They don't break it down into SDM and non SDM. The Statistics are generelized for every brand.
I think they're looking for lenses dead on arrival, not defective after periods of use (or storage).
02-08-2010, 10:39 PM   #6
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QuoteOriginally posted by Alex00 Quote
Statistics below shows that Pentax have the least amount of lens failure rates compared to other brands. cannon lenses have the most defects.
Thank you. Run along now sport...
02-08-2010, 10:40 PM   #7
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QuoteOriginally posted by asdf Quote
I think they're looking for lenses dead on arrival, not defective after periods of use (or storage).
Still, pentax have the least compared to other brands.
02-08-2010, 10:42 PM   #8
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QuoteOriginally posted by Alex00 Quote
Still, pentax have the least compared to other brands.
Yup. Note that the bias of Canikonians is to blame Sigma and Tamron lenses for focusing problems and the like, when it's often a problem with the camera.

02-08-2010, 11:35 PM   #9
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QuoteQuote:
Alex00: Statistics below shows that Pentax have the least amount of lens failure rates compared to other brands. cannon lenses have the most defects.
Sorry, but that is not what the "statistics below show." If I produce & sell 12,012 cars and have 907 returned as defective, and you produce 1239 cars and have 86 returned as defective then, for all practical purposes, both of us produce cars equally reliable. If anything, since the Canon stats draw on a much larger sampling, the Canon stats are more likely to be reliable.

In fact, according to this survey, Pentax is @ 93%, Canon @ 92% and Nikon is also at 92 %--for statistical purposes, when you factor in the possibilities for survey error, this is dead heat.

QuoteQuote:
asdf: I think they're looking for lenses dead on arrival, not defective after periods of use (or storage).
You are correct---here is the link to the actual survey. which clearly spells out the parameters of the survey: Lens Defect Survey

Note, the survey relies heavily upon the integrity of the survey taker, with virtually no controls to user access. For example, a point and shoot user could take the survey and make any claims they desired.

What would be useful, though I doubt we here would ever see it, is the actual data as released from Pentax, Canon and Nikon. With that data, we could then make some generalizations.

However, as many of us here already know, we do not need to see Pentax release figures on SDM failures to discern there is a problem now--do we!
02-08-2010, 11:55 PM   #10
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the statistics is unreliable or does not draw any real conclusion.

here is the reason why, taken and quoted from the link,

"The bottom line is therefore that these numbers should be treated with some skepicism. When there are enough entries I may be able to do some more statistical analysis, but the results are only as good as the input data, and I have no direct control over that. As they say in the TV ads for 'psychic advisors', this data is for amusement purposes only. It's interesting, but don't read things into it that may not be there. "
02-09-2010, 05:31 AM   #11
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