Lens Defect Survey


Mike-P

Link Posted 06/02/2010 - 23:58
LINK

Pentax is running last at the moment so please add your findings.
. My Flickr

johnriley

Link Posted 07/02/2010 - 00:05
That's an odd survey, but at least they admit that the results are highly doubtful.
Best regards, John

Hyram

Link Posted 07/02/2010 - 14:47
Rubbish as a survey as anybody can deliberately skew the results by clicking on any make.
Hyram

Bodies: K20D (2), K10D, Super A, ME Super, Auto 110 SLR, X70, Optio P70
Pentax Glass: DA* 300, DA* 60-250, DA* 50-135, DA* 16-50, DA 70 Ltd, FA 31 Ltd, DA 35 Ltd, DA 18-55 (2), DA 12-24, DA 10-17, M 200, A 35-70, M 40, M 28, Converter-A 2X-S, 1.4X-S, AF 1.7, Pentax-110 50, Pentax-110 24
Other Glass: Sigma 105 macro, Sigma-A APO 75-300
Flash: Metz 58 AF-1 P, Pentax AF160FC ringflash, Pentax AF280T

Gwyn

Link Posted 07/02/2010 - 15:37
Well Pentax seem to be as good as Canon and nearly as good as Nikon. But maybe my results have up the percentages - I've never had a bad Pentax lens. Not had a bad Sigma one either for that matter.

Mike-P

Link Posted 07/02/2010 - 15:56
When I posted last night there had been 150ish Pentax responses and we were behind Canon, Nikon, Sony and Olympus.

Not so bad now
. My Flickr

Blincodave

Link Posted 07/02/2010 - 15:57
Well I've added my 3 Pentax lenses - all 100%

Dave

johnriley

Link Posted 07/02/2010 - 16:21
I've lost track of how many new pentax lenses I have bought - many dozens for sure. I have never had a faulty one.
Best regards, John

iceblinker

Link Posted 07/02/2010 - 17:01
Two of the six new Pentax lenses I've bought in the last five years have been faulty.
~Pete

RichardDay

Link Posted 07/02/2010 - 18:07
I've bought 13 Pentax lenses in the last 5 years, had 3 faulty ones (2 of one design, 1 of another), I did find a batch of one model that had high variance when I tested them in store, 4 out of 5! Some designs appear more prone than others.

Also had 5 Sigmas, all faulty , 3 Tamrons, none faulty !

I recently tried 5 Tamrons of one design, one was very good, the rest were poor with a wide variance. I also tried a Sigma 150-500 which was very good. - I think that it is very much luck of the draw, especially with new designs that are in their first 6-12 months of release, updates usually (but not always ) have a much lower incidence of faults.

Having recently made the mistake of not checking a product carefully at the time of purchase , I now check my actual unit of any precision or electronic product "in store" beforehand, as the cost of return, or travelling back and forth, can be very significant. I have made a blind online purchase recently (a D-Xenon 100mm macro), luckily it was okay.
Best regards
Richard Day

Profile - link - (click on About for equipment profile) - My Flickr site - link

Lloydy

Link Posted 07/02/2010 - 22:52
Nearly neck and neck with Canon when I added my 50% failure rate to the survey.

Lance B

Link Posted 08/02/2010 - 02:00
This is as it stands at the time of my post:

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

Canon lenses - 12002 with 905 defects
The probability of getting a good lens is 92 %
The probability of getting 5 Canon lenses in a row is 68 %

Sigma lenses - 2624 with 579 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 - 1300 with 201 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 - 428 with 69 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 - 2182 with 171 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 - 1035 with 77 defects
The probability of getting a good lens is 93 %
The probability of getting 5 good Pentax lenses in a row is 68 %

Minolta/Konica/Sony lenses - 582 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 58 %

Other lenses - 841 with 89 defects
The probability of getting a good lens is 89 %
The probability of getting 5 good Other lenses in a row is 57 %


It would seem that Pentax has the best rating at 93% probability of getting a good one.
Cameras:K-7/K20D/*ist D/K10D
Lenses:DA14 f2.8, A16 f2.8, FA20 f2.8, FA31 f1.8, DA35 f2.8 macro, FA43 f1.9, FA50 f1.4, A50 f1.4, A50 f1.2, FA50 f2.8 macro, DA*55 f1.4, FA77 f1.8, DFA100 f2.8 macro, A100 f2.8, DA*300 f4, FA*300 f4.5, DA10-17 FE, DA12-24 f4, DA*16-50 f2.8, DA17-70 f4, FA*28-70 f2.8, DA*50-135 f2.8, DA*60-250 f4, FA*80-200 f2.8.
Flashes:AF540FGZ, AF360FGZ

Mike-P

Link Posted 08/02/2010 - 06:52
Ah, I can go off to work now in the knowledge my work is done.
. My Flickr

niklas

Link Posted 08/02/2010 - 11:38
This survey has no fidelity.

Niklas
15mm - 450mm equivalent, and still can't reach...

hefty1

Link Posted 08/02/2010 - 15:55
I've bought 7 "new" lenses in the last 5 years, 6 Pentax and 1 Tamron. All have worked perfectly so I've added those in.
Joining the Q

johnriley

Link Posted 08/02/2010 - 16:04
I would suspect that these results are very skewed. The idea that out of 5 lenses at best the chance of one of them being faulty was as high as 40% is dreadful.

I can see that with the complexity of modern lenses the chance of a fault must be higher than with a manual focus lens, but even so....

And then we see the Sigma result...
Best regards, John
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