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Shutter speed
- Thread starter bilgami
- Start date
dmitriandsnow
Well-known member
Re: Shutter speed
Just above your post there is a tutorial.
http://www.dvxuser.com/cgi-bin/DVX2/YaBB.pl?board=Events;action=display;num=1087835287
Just to clear couple points, shutter does not modify, affect framerate. Shutter modifies and affects exposure. Shutter time is exposure time. For example if shooting 24fps each frame is exposed to light 1/48th of a second. You ask why isn't it exposed 1/24th to match the frame rate well if in fact it did (which it can if you subject it to) a flicker would appear unlike the double bladed shutter that repeats the frame two times. Strobing is a natural occurance in motion picture shooting 24fps at 1/48th produces strobing unnoticed to our eye, moving the shutter up 1/96th in theory ( i don't even think 1/96th is a standard shutter speed is it?) exposes each frame a series of four times. Hopefully you get the idea but check on the above thread i am a newbie.
Just above your post there is a tutorial.
http://www.dvxuser.com/cgi-bin/DVX2/YaBB.pl?board=Events;action=display;num=1087835287
Just to clear couple points, shutter does not modify, affect framerate. Shutter modifies and affects exposure. Shutter time is exposure time. For example if shooting 24fps each frame is exposed to light 1/48th of a second. You ask why isn't it exposed 1/24th to match the frame rate well if in fact it did (which it can if you subject it to) a flicker would appear unlike the double bladed shutter that repeats the frame two times. Strobing is a natural occurance in motion picture shooting 24fps at 1/48th produces strobing unnoticed to our eye, moving the shutter up 1/96th in theory ( i don't even think 1/96th is a standard shutter speed is it?) exposes each frame a series of four times. Hopefully you get the idea but check on the above thread i am a newbie.
Barry_Green
Moderator
Re: Shutter speed
There's no projector-like flicker that happens. Shooting at 1/24 means there will be quite a bit of motion blur, not unlike shooting with a 35mm still camera on a slow shutter speed.
Shooting at a faster shutter speed doesn't expose each frame for any more times. Shooting at a faster shutter speed just means that the frames receive light for a shorter period of time.
There's no projector-like flicker that happens. Shooting at 1/24 means there will be quite a bit of motion blur, not unlike shooting with a 35mm still camera on a slow shutter speed.
Shooting at a faster shutter speed doesn't expose each frame for any more times. Shooting at a faster shutter speed just means that the frames receive light for a shorter period of time.
dmitriandsnow
Well-known member
Re: Shutter speed
Glad i put that to test in here i wasn't sure about that stuff.
Just to clarify what i was talking about was the frequency of the flicker from 24hz to 48hz that is in video. Man i remember reading about this stuff somewhere and i remember that with a standard 180 degree shutter in order to properly expose the shutter frequency is increased to 1/48th because of the flicker that is produced by the slower shutter at 1/24th. Eh well thanks for setting me on track Barry.
Glad i put that to test in here i wasn't sure about that stuff.
Just to clarify what i was talking about was the frequency of the flicker from 24hz to 48hz that is in video. Man i remember reading about this stuff somewhere and i remember that with a standard 180 degree shutter in order to properly expose the shutter frequency is increased to 1/48th because of the flicker that is produced by the slower shutter at 1/24th. Eh well thanks for setting me on track Barry.