# Lens Defect Survey

Best regards, John

*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

Dave

Best regards, John

*~Pete*

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

**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 %

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

Niklas

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

*Joining the Q*

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

Mike-P

Member

Hampshire UK

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

. My Flickr