Posted 28 February 2006 - 01:30 AM
Posted 28 February 2006 - 01:43 AM
So if the camera is running at 24 fps and the shutter angle is 180 degrees, then the exposure time is half of 1/24th of a second: 1/48th of a second.
Unfortunately you can't really increase the exposure time for low-light without slowing the frame rate down, because most film cameras don't open the angle more than 180 degrees (Panaflexes can open to 200 degrees but that's hardly an increase in exposure).
However, you can close down the shutter angle to shorten the exposure times. Closing from 180 to 90 degrees will cut the exposure by half again, from 1/48th to 1/96th of a second per frame at 24 fps. But then you start to get rather choppy-looking motion. So playing with the shutter angle to control exposure time is not generally done; usually you only mess with the shutter angle to create some odd motion effects or to sync with a cycling light source of a certain frequency.
Posted 28 February 2006 - 01:51 AM
Posted 28 February 2006 - 02:17 AM
that is very interesting,obviously ive never touched a cinema camera hehe...my brain has to see something to understand something usually,although that was explained well and i think i understand a bit better.so exposure is most easily controlled with iris/aperture right?and i assume film speed plays a major roll.thank you for responding to my questions.
Yes, exposure is controlled more often by iris (f-stop), film stock speed, filters, and light levels created rather than manipulating shutter angle.