Vibrating adapters and overcranking

utopeya

utopeya

Member
I'm sorry if this has been answered many times before, but i sort of looked around and didn't really see anything definitive. I know that there are issues with using faster shutter speeds on vibrating adapters, but I was wondering about the problems with overcranking.
For instance, if I'm using an HVX with a Letus Extreme at 720p24N and a standard 180-degree shutter, and I want to overcrank at 60fps, will I start seeing the grain in the glass? (I suppose I am essentially using a 1/120 shutter speed here.)
Would the Letus Extreme work in these circumstances, or would I be better off going with a spinning adapter like the SGPro if I anticipate doing a lot of variable-speed work?
Thanks for your help.
 
Yeah, this is a valid question and I would like to know too. When Im shooting 60 FPS Im a little scared to use 90 degree/240th shutter on vibrating adapter... maybe I shouldn't be?
 
This is something that I'm interested to know about too.

I'm set to be using one of these adaptors on a film shoot next week, but don't have much time to test it first. Ideally we'd like to shoot 720pn and overcrank.
 
Hi Utopeya,
You will have a better chance of success with a spinning adaptor. Also see my post below:


Posted in Alex's Thread: "Depends on what you consider grain...I have shot 60 over 24 and found the grain to be acceptable. I have also found the grain to be unacceptable at simply 24pn. It all depends on what your tolerances are and what the particular project is.

I have found that increasing the shutter angel to 220 or more and always using fresh batteries can help blur the grain. Also, avoid large expanses of bright sky. "


J
 
This is precisely why we introduced the MP.1 version of the Brevis35 which has oscillation controlled by a microprocessor, and externally adjustable for tuning under these conditions. Overcranking to 60p is not an issue, providing you keep shutter speed under 1/250s. You can sneak 1/500s, but lighting should be good, and fast lenses used, run at f2.8 or faster with our CF1 or CF1Le imaging elements.
 
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