Operation of the anti-shake setting would be pretty annoying hand-held and very obvious: you'd press the shutter button, the mirror would swing up and viewfinder be dark for a minimum of a second before the shutter was released. You can set it for up to 10 seconds, if I recall correctly. Usually, with a very long lens (200-400mm) and exposure times in the 1/8 to 1/30 second range, I set it for 2-3 seconds. It (and the IR remote release) is also very useful when doing high-magnification macro/copy work.
Originally Posted by cam
The E-1's metering with adapted manual lenses is funky, just like the Panasonic L1 actually, which is why I long ago stopped using adapted manual lenses on these SLRs. Manual metering with centerweighted averaging setting is about the most accurate, but I gave up and only use FourThirds lenses on these cameras now. The Panasonic G1 handles metering with adapted manual lenses FAR more accurately, and with less metering range restrictions. It's also worlds easier to critical focus manually, particularly with a slow lens, in dark conditions.
I've shot with the Summilux in dense fog and light rain taking only normal precautions, no problems. It may not be weathersealed but it seems to be adequately sealed anyway.
The 11-22/2.8-3.5 *is* weathersealed, however, and is a wonderful pick for inclement conditions with a range from ultrawide to nearly normaly FoV. It's a super useful lens.
Just to get you going ...
Moonrise Over The Quad - Stanford University 2008
Olympus E-1 + Summilux-D 25mm f/1.4 ASPH
ISO 400 @ f/1.4 @ 1/200 second (hand-held)