Since both lens and camera body are supposed to be weather and dust shielded, what could be better than to test it in a workshop? Luckily I found one open not too far off.
All photos where shot in RAW-format and developed in Adobe Lightroom 3.41. For the technically minded I have included some of the exposure data.
The one above was shot outside the workshop, with 1/80 sec, f/10, ISO 800 and focal distance 32mm (equiv 51mm)