Timelapse night shot of Akashi Strait Bridge, longest suspention bridge in the world is tested on GH1 with Canon FD lens 50mm/F1.4, 28mm/F2.8 and kit lens at 28mm/F4.7 at video mode and interval still photo mode, respectively.
I found FD50mm/F1.4 can be used even at video mode on GH1 under the circumstance although some astigmatism occured. Kit lens can only be used at its continuous shutter mode L (2 shots/sec) to get adequate eｘposure.
Video with FD28mm/F2.8 is apparently under exposure at the slowest shatter speed of 1/30 sec.
Brightness of FD50mm/F1.4 is more than expected and more than calculated based on the shooting condition with kit lens at interval mode. I don't know why.