FPS Override for timelapse - Desired FPS vs. Actual FPS

[tidelander]

I want to use FPS Override feature to shot some time lapse. I use ML nightly build for 5d3.113 from July 2, 2015.
I need really slow shutter speed at least 2 seconds long, optimal 4 seconds long.
In 'FPS Override' menu I can choose 'Desired FPS' as low as 0.150 (~6.6 seconds exposure) but 'Actual FPS' gets stuck at 0.554 (~1.8 seconds exposure). See image below:



If I start playing with timers I can make it only worse ('Actual FPS' just gets higher, not lower as I need it).
This behavior persists for all 'Desired FPS' below 0.5 (0.15, 0.2, 0.25 ...) - 'Actual FPS' gets stuck at 0.554 and I cannot make it go lower. Once 'Desired FPS' gets to 0.75, 'Actual FPS' also becomes 0.75.

Can someone explain me how can I get 2 or 4 seconds exposure with FPS Override on 5D3?

[halbmoki]

Each camera has a sligthly different FPS override limit for video. For example, my 50D goes from 0.214 to 30.422 FPS.

I think, you can solve your problem by activating "Sync w. Shutter" in the advanced FPS override settings (at the very bottom of the standard FPS override menu). This makes each frame last as long as the current shutter speed, so you can theoretically reach 0,0333 FPS for 1 frame per 30sec. This does not work in video mode, though, so you'd have to use the intervalometer and silent picture to record your images. I haven't tried actually recording anything like this, but it should work.