16mm time lapse motor

I'm new to 16mm and trying to get my head round the Tobin Time Lapse Motor. I'm using a Bolex H16 Reflex (RX5).
My questions are concerned with correcting exposure/ FPS/ exposure time.
The TTL runs at .75 FPS, exposure time 1/2 sec.

I'm trying to shoot some footage of light and shadows moving through trees over the course of the day.

Firstly I'm concerned that the 1/2 sec exposure time will lead to blurred images if the trees are swaying slightly. Would this be the case and is there any way round this?

Secondly, is there an easy way of calculating how to set the exposure correctly? I have read the manual but find it confusing. I'm using 250D film. I have a .6ND filter.

:hmm:
 
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