Variable Frame Rate conversion and shutter speeds?

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pepboy

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I am creating a film that will be entirely slow motion.
I want to create some tests to determine just how slow I want the footage to look.

I plan to shoot a “master” clip at the max variable frame rate of 60fps to give myself the most range.
I plan to use FCP’s Frame Rate Converter to create several different speed conversions.

I believe that different variable frame rates require different shutter speeds to look their best.

If I shoot 60fps (with a shutter speed appropriate for 60fps), and then convert this down to the equivalent of 48fps, will I have an exposure issue?

Would the 48fps footage look better if shot “in-camera” with a shutter speed specifically chosen for 48fps?
 
exposure is not the issue - its the rendering of motion. exposure is looked into the image once shot. So playback at different rates wont change that but since you are showing less frames per second the blur or non blur of motion may not be as appropriate for the converted playback rate - test though - it could be acceptable for you.
 
You still may want to mess around with in-cam exposure just to see the results:

Base setting: Rec format at 720p24PN; film cam; frame rate=60frame. The syncroscan is at 180.0d default.

Fun setting 1: change the syncroscan to 350.0d to get more exposure and blur.
Fun setting 2: change the syncroscan to 45.0d for the "Saving Private Ryan" look.

You can do about the same thing using the "Shutter" and "Speed" buttons. Leave the cam in Film cam mode, but use the shutter/speed buttons to 1/24 and 1/1000 shutter speed.

Edit on a 24p line in FCP
 
Indywannabe said:
Fun setting 2: change the syncroscan to 45.0d for the "Saving Private Ryan" look.
Click to expand...

Forgive my ignorance, and I can probably guess based on the sycroscan setting, but what exactly would you describe as the "Saving Private Ryan" look? I would guess that it would just be almost an overly clean, no blur picture, but wouldn't you also need a ton of light for it to work properly?
 
The "Saving Private Ryan" look refers to the strobing effect seen in respect of objects moving within the frame.
 
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