Poll - SDM failures

Started Sep 15, 2009 | Discussions thread
awaldram
awaldram Forum Pro • Posts: 13,243
Re: so the 16-50 is the worst...

exp1orer wrote:

...and the most expensive gamble if anyone would purchase this lens. i'm right in my decision to hold the purchase of 16-50 until pentax fixed the issue.

16-50: 19 failures from 55 = 34.5%
50-135: 13 failures from 73 = 17.8%
17-70: Two failures from ten = 20%
200: One from 11 = 9%
300: One from 22 = 4.5%
60-250: all good from 13 so far = 0%
55: Eight good copies = 0%

and then you read a few people here defending pentax and telling everyone that there's no problem with 16-50.

And just to get some perspective heres lens rentals failure rate for other manafacturers

Sigma 120-300 f2.8 41% Zoom mechanism, calibration, autofocus
Sigma 18-200 OS 37% OS, Autofocus, zoom, barrel separation
Nikon 18-200 OS 31% OS, Autofocus, zoom
Sigma 50-500 31% Zoom mechanism, autofocus
Canon 300 f4 IS 25% IS, autofocus electronics, barrel separation
Tamron 70-200 f2.8 27.5% tight mount (Canon), autofocus
Tokina 12-24 f4 PRO 25% zoom mechanism, autofocus
Nikon 17-55 f2.8 25% Calibration, zoom ring, motor burnout
Canon 50 f1.4 22.5% AF motor
Canon 35 f1.4 22% Calibration, focus mechanicals
Canon 17-55 f2.8 EF-S IS 22% IS failure, AF electronics, ERR99
Canon 10-22 EF-S 17.5% barrel separation, autofocus
Nikon 70-200 f2.8 VR 17% zoom mechanism, manual focus clutch
Nikon 17-35 f2.8 17% calibration, electronics
Nikon 80-400 15% Electronic issues
Canon 85 f1.2 13% Electronic issues
Sigma 30 f1.4 12.3% calibration
Canon 24-70 f2.8 11% Calibration, zoom mechanism
Canon 100-400 IS 11% Zoom tension ring, Err99, calibration
Nikon 14-24 f2.8 10% zoom mechanism

As you can seen the 16-50 does not make top failing lens.
the 50-135 would be mid table.

So as I've previously stated thought he 16-50,50135 and 17-70 have poorer reliability records they are not at the level where any manufacturer would do anything about it.

They are all within acceptable level (maybe not from our point of view).

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