ok, thanks for explaining, quess this is quite clear.
I don't see why they don;t make a mechanism that automaticly triggers the mirror in sync with the exposuretime, but what the hell. I'll manage.
In a few months it'll be a routine.
I will surely get a 55 mm wide angle. and on longer terms a tele lens, for now I will use my 105mm, just like I mostly used my 50mm lens on my 35mm camera.

By the way: One more thing:

If I look trough the camera, ergo the lens, the image is somewhat warmer than in reality. Some orange like glow. My old camera had none of this. I checked if a filter was present in fornt of the lens, but that was not the case. Anyone a clue??

Thanks again, SAM