Still not clear on how shutter speeds and frame rates work...help?

DavidBeier

DavidBeier

Veteran
Finally got Barry's book and have been going through it page by page and experimenting. One thing that I'm still not clear on is the correlation between shutter speeds and frame rates in FILMCAM mode. If I turn the shudder off (just push the shudder button) then I see no difference in exposer when changing frame rates. When it's on, regaurdless of what shudder speed I set in the SyncoScan setting, the frame rate affects the exposer time as one would expect (brighter for slower FPS, darker for faster). In the last page of his section on Syncro Scan, Barry says, "The short exposure times when overcranking, and long exposure times when undercranking result in different amounts of crispmess or motion blurr. If you don't use the shutter degrees of Syncro Scane (and instead opt for fixed exposure) you won't have to compensate for exposure, but your footage won't be nearly as filmlike." I know 24fps standard shudder is 180d. Do I simply have to set it to this when using variable frame rates to get the appropriate motion blur or do I have to adjust it to the typical one for each different frame rate?
 
With the shutter "off" or in any of the fixed speeds (like 1/24, 1/60, 1/100, 1/250, 1/500, 1/1000) then the shutter angle never comes into play, and your exposure will be constant regardless of what frame rate you're shooting at.

Variable exposure only comes into play if you use FILM CAM mode, and you set your shutter speed to the SYNCRO SCAN speed. If you do that, then the shutter speed will track with the frame rate. At 30fps it'll be twice as bright as it will be at 60fps, etc.
 
Barry,

how about if say i wanted more of a motion blur instead of flicker when in progressive mode? Should i set the syncroscan higher or lower? its default is 180d, would for example 50d make it smoother? or 300? I notice the lower the darker the image gets..

thanx
 
ok, i was a bit confused because it seemed that the brighter it got the choppier it got, like for example when i set the shutterspeed to 1/25 it seems quite choppy, maybe i need to change some other setting, i have the cam in film camera mode and also im shooting on tape(pal), not P2
 
yeah.. i set the shutter also aroun 180-220 depending on the scene, its just it seems that the higher i go the brighter the image of course.. but the choppier also..
 
ok i think i figured it out, :), the choppyness was the lcd screen on the cam and the monitor i was using,.
 
I typically am always in FilmCam mode 720p/24pn 24fps, and I just hit the shutter button and adjust. I am shooting a lot of movement, and want the the clearest frame per frame. If using the degrees will make that so, I definitely want to know

Okay so why would you use a the degrees, over the 1/th's?
Also as Barry's book stated, can't remember where. But for example sake. He stated that 1/60th is equivalent to a 220 degree shutter, and the look would be exact I would think.

thanks
 
^
I don't know if that's accurate. I'm pretty sure higher degree numbers correspond to higher numbers under one. 1/60th makes the image brighter but an angle of 220 makes it darker.
 
YA :) AS my post state it that was FOR EXAMPLE SAKE. And is not true to standard. But if someone can help and clarify. Maybe a chart to why we would want to use a shutter or angle in a certain circumstance. Here is a chart demo I think we be a start.

SurJones said:
I typically am always in FilmCam mode 720p/24pn 24fps, and I just hit the shutter button and adjust. I am shooting a lot of movement, and want the the clearest frame per frame. If using the degrees will make that so, I definitely want to know

Okay so why would you use a the degrees, over the 1/th's?
Also as Barry's book stated, can't remember where. But for example sake. He stated that 1/60th is equivalent to a 220 degree shutter, and the look would be exact I would think.

thanks
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