Posted 14 September 2011 - 10:19 AM
i know verrywel abput shutter speed but i want know about diffrent ,thnx
Posted 14 September 2011 - 11:28 AM
BTW It would be better to ask the technical questions in another part of the forum, since this section is about cinematographers and their work, rather than technical questions.
Posted 14 September 2011 - 11:42 AM
To put it in simplest terms, in motion picture cameras, the shutter
generally takes the form of a rotating disc with a wedge cut out of it,
like a pie with a missing slice. The open wedge is the part that allows
light to reach the film.
The term "shutter angle" refers to the angular sweep of the open wedge.
So, a 180 degree shutter angle would be half of the total disc.
A 90 degree shutter angle would be one-quarter of the total disc, and so on.
Some cameras have a fixed shutter angle, while others have variable shutter angles.
Shutter angle is one of the factors that determines shutter speed.
The other factor is the speed at which the shutter rotates.
At 24 frames per second, the shutter makes one complete revolution every
24th of a second. If our shutter angle is 180 degrees, then for exactly
one-half of that time the shutter will expose the film, that is, the
shutter speed will be 1/48th of a second.
Here's the formula:
Exposure time (or shutter speed) = (Shutter angle/360) X (1/frames per second)
Wide shutter angles naturally provide longer exposure times, while narrow
shutter angles have shorter exposure times.
Besides controlling the amount of light, the shutter angle will also affect
the amount of blur a moving subject records on the film. Wide angles allow
more blur; narrow angles allow less blur.
Posted 14 September 2011 - 12:55 PM