As I am being new to the forum, please allow me a quick introduction. I am from Germany being specialized on landscape and wildlife and started with my first SLR – a Pentax ME – more than 30 years ago. In 2004 I have switched to Canon Digital, but stayed with my LX and MZ-S together with a “Limited” lens selection.
Earlier this year, I have added a silver K-5, which fits nicely my silver Limited lenses and is now due to the low weight my mountaineering equipment.
Now coming to the topic. Being a customer of Isarfoto, I was one of the test group described in the link of feverbeaver's post – in detail, I am the one in red/black in the second picture ☺.
The weather conditions on 8 October 2011 – and the two days before – in southern Bavaria were really bad with wind coming from the North pushing the rainy clouds to the alps. The first part of the workshop took place on Zugspitze, the highest German mountain coming close to 3.000 meters. Up there, we had -6 °C and strong snow. The first picture is one I have taken up there with the 645D and the 2.8/55.
In the afternoon, we went down to Partnachklamm, a narrow gorge in the foothill of Zugspitze. It still rained and the gorge walls were dripping like showers. We did not use any rain covers and the 645Ds got completely soaked. The second picture gives you an impression of the gorge taken again with a 645D and 2.8/55.
The 645D is stated as “weather sealed”, but what we have done, was more like “water resistant”. There wasn't a single failure of a body or lens. Even the older 645 lenses, which do not have the “WA” in their names, did not fail.
Best regards
Bernd