@ giorgio
Your maxpatch worked well with the camera of my MacBookPo, but the Video-Camera (Sony HRV-A1E), I had available, is not supported in jitter, I see nothing in the getinputlistdevice in the jit.qt.grab - object (but the camera is supported in Quicktime and FCP).
@ lee wnag
TimeLapse with SLR - cameras: I am aware of progs for remote-control for Nikons and Canons..
Also tethereing with Adobes lightroom would be an approach.
Also there are hardware remote timers (HAMA, Hahnel etc) for cameras, but every brand do need a different one, because of the their proprietary connectors.
I ended up (because lack of time and no possibility to rent a SLR Camera with the right remote) shooting with the video-camera. Now I have to deal with a lot of GBs :-)
Anyway, thanks for your advices !
sepp