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12-07-2010, 11:40 PM   #31
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Although not specifically listing SDM lenses the LensPlay Lense Failure Survey has some interesting results :

There have been responses about Canon lenses from 2960 users
There have been responses about Sigma lenses from 1509 users
There have been responses about Tamron lenses from 949 users
There have been responses about Tokina lenses from 363 users
There have been responses about Nikon lenses from 558 users
There have been responses about Pentax lenses from 350 users
There have been responses about Minolta/Konica/Sony lenses from 182 users
There have been responses about Other lenses from 351 users

Lens Defect Survey

Survey Results
Note: Values are greyed out if there are less than 300 lenses sampled

Canon lenses - 13134 with 1001 defects
The probability of getting a good lens is 92 %
The probability of getting 5 Canon lenses in a row is 67 %

Sigma lenses - 2974 with 668 defects
The probability of getting a good lens is 78 %
The probability of getting 5 good Sigma lenses in a row is 28 %

Tamron lenses - 1476 with 217 defects
The probability of getting a good lens is 85 %
The probability of getting 5 good Tamron lenses in a row is 45 %

Tokina lenses - 496 with 81 defects
The probability of getting a good lens is 84 %
The probability of getting 5 good Tokina lenses in a row is 41 %

Nikon lenses - 2417 with 199 defects
The probability of getting a good lens is 92 %
The probability of getting 5 good Nikon lenses in a row is 65 %

Pentax lenses - 1539 with 99 defects
The probability of getting a good lens is 94 %
The probability of getting 5 good Pentax lenses in a row is 72 %

Minolta/Konica/Sony lenses - 654 with 61 defects
The probability of getting a good lens is 91 %
The probability of getting 5 good Minolta/Sony lenses in a row is 61 %

Other lenses - 959 with 97 defects
The probability of getting a good lens is 90 %
The probability of getting 5 good Other lenses in a row is 59 %

12-08-2010, 12:22 AM   #32
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Really interesting survey but do not overlook/discount the opening paragraph:

QuoteQuote:
This is a survey intended to try to look at the quality control (QC) of lenses. 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.
That certainly puts the lens survey in a completely different light than the discussion of lenses failing under normal to even light use over time like is the issue with SDM glass.

QuoteOriginally posted by Frogfish Quote
Although not specifically listing SDM lenses the LensPlay Lense Failure Survey has some interesting results :

There have been responses about Canon lenses from 2960 users
There have been responses about Sigma lenses from 1509 users
There have been responses about Tamron lenses from 949 users
There have been responses about Tokina lenses from 363 users
There have been responses about Nikon lenses from 558 users
There have been responses about Pentax lenses from 350 users
There have been responses about Minolta/Konica/Sony lenses from 182 users
There have been responses about Other lenses from 351 users

Lens Defect Survey

Survey Results
Note: Values are greyed out if there are less than 300 lenses sampled

Canon lenses - 13134 with 1001 defects
The probability of getting a good lens is 92 %
The probability of getting 5 Canon lenses in a row is 67 %

Sigma lenses - 2974 with 668 defects
The probability of getting a good lens is 78 %
The probability of getting 5 good Sigma lenses in a row is 28 %

Tamron lenses - 1476 with 217 defects
The probability of getting a good lens is 85 %
The probability of getting 5 good Tamron lenses in a row is 45 %

Tokina lenses - 496 with 81 defects
The probability of getting a good lens is 84 %
The probability of getting 5 good Tokina lenses in a row is 41 %

Nikon lenses - 2417 with 199 defects
The probability of getting a good lens is 92 %
The probability of getting 5 good Nikon lenses in a row is 65 %

Pentax lenses - 1539 with 99 defects
The probability of getting a good lens is 94 %
The probability of getting 5 good Pentax lenses in a row is 72 %

Minolta/Konica/Sony lenses - 654 with 61 defects
The probability of getting a good lens is 91 %
The probability of getting 5 good Minolta/Sony lenses in a row is 61 %

Other lenses - 959 with 97 defects
The probability of getting a good lens is 90 %
The probability of getting 5 good Other lenses in a row is 59 %
12-08-2010, 12:24 AM   #33
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Bit off topic - but what does 'SDM' stand for?
12-08-2010, 12:50 AM   #34
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Snipenekkid - I don't think (reading through the whole survey) that it means lense failure during normal use, they specifically go on to mention lenses being dropped etc. and this is what they are trying to exclude. I may be wrong in that assumption though.

12-08-2010, 05:47 AM   #35
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QuoteOriginally posted by spock Quote
bit off topic - but what does 'sdm' stand for?
slowly dying motor !
12-08-2010, 05:50 AM   #36
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QuoteOriginally posted by Pentaxor Quote
slowly dying motor !
nice one...LMAO
12-08-2010, 05:54 AM   #37
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QuoteOriginally posted by Frogfish Quote
Snipenekkid - I don't think (reading through the whole survey) that it means lense failure during normal use, they specifically go on to mention lenses being dropped etc. and this is what they are trying to exclude. I may be wrong in that assumption though.
that is the whole issue. I would believe the defect ratio only includes lenses that are lemons upon purchase, not lenses that stopped working after a year or so. honestly, I would prefer something that is replaced immediately and get a good copy that would work for more than a decade, rather than have something working temporarily and would stop after it's 1 year warranty expire after a year.

maybe Pentax should include putting a best before label with their DA* zooms.
12-08-2010, 06:39 AM   #38
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Hmm, while the survey just covers DOA lenses, and thus not the SDM problem, I think it still shows that Pentax QC is better than one may think from reading this forum these days.

Btw. my DA70 needed repair after 2 years due to a manufacturing error - three screws inside the lens were not properly fastened.

12-08-2010, 08:05 AM   #39
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QuoteOriginally posted by Spock Quote
Bit off topic - but what does 'SDM' stand for?
SDM officially stands for Supersonic Drive Motor, however it's also known as many other things around here.
12-08-2010, 08:18 AM   #40
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QuoteOriginally posted by snipenekkid Quote
First I could give a flip about non-L glass. And next why not include the WHOLE comment rather than the sound bite snippet that lets your cherry pick to come off as the "great defender of the faith"....rather than someone who can't face the facts...SDM is not a reliable system. And the Canon "L" series sure has had their set of clunkers off the line to, but they make 10x the number of lenses as Pentax but likely have the NUMBER of bad lenses.
Settle down now, I wasn't trying to upset you. I didn't include your whole comment because I didn't want to express an opinion about ...color rendering and the new sensor... topics which aren't relevant to the subject being discussed here, SDM. What's also interesting is even though I didn't quote your entire rant it at least appears I read your entire post. In my reply to you I mentioned I had an SDM lens which has now failed twice. What facts can't I face? I don't own any SDM lenses and won't ever own one again. I've never implied SDM is reliable.

What I had hoped to demonstrate in my post was each brand has it's strengths. If Canon's strengths work better for you than Pentax's, maybe you should switch systems instead of complain about new sensors, etc. If Pentax's strengths suit your shooting style and needs then I'm sure many of us will be happy to have you stay.
12-08-2010, 10:17 AM   #41
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I haven't even received my K-x yet and I have taken the SDM lenses out of my pre-shopping cart.
Power of the forum
12-09-2010, 01:40 PM   #42
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Gosh, just been elsewhere on the site and come back to see all this info. Looks like the 16-50mm is off my list again. I certainly would like to know what is the failure? I can't just stop working... something gave on it?
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