Originally posted by MarkJerling Or as we say here in New Zealand: "Yeah right!"
We say that here too and I concur.
That said, this member has reported three bad copies of the DA 560/5.6 one of which "fell apart", so they do speak from experience. I am sure you remember the thread.
In addition, we seem to have a tradition of reports of spontaneous disassembly here on PF. Google "Pentax lens fell apart" and Pentax Forums comes to the top of the list with a large number of results spanning several long threads. I remember most of those threads. In a number of cases, I suspected unintended abuse (attempting manual focus on a non-quickshift lens while the AF pawl was engaged) and in others perhaps a history of simply treating things roughly and in others, a systemic manufacturing defect. There are so many possibilities...
Google | pentax lens fell apart site:www.pentaxforums.com
Continuing...Some were obviously rough previously owned lenses and a few members had actually had multiple similar failures (heavy handed zoom technique?) and a few even admitted to the lens having sustained a drop to the pavement.
FWIW, I actually own one of the fall-apart lenses...still solid in my hands...
I will also admit to having accidentally delivered my DA 50/1.8 (plastic fantastic) from counter height to the floor of my kitchen. It bounced, with no obvious damage and seems to work just fine, even with the strong AF motor on my K-3...
Steve
(...inviting ill fortune, perhaps...)