Edited by Eduardo Mayen, 11 September 2005 - 10:58 PM.
Strobe Light with no Shutter
Posted 11 September 2005 - 10:57 PM
Posted 12 September 2005 - 12:03 AM
Posted 12 September 2005 - 02:46 PM
I'm planning on shooting a fantasy sequence in a movie with a strobe light. I thought of completely removing the shutter and letting the strobe be the shutter itself and determine the exposure. What do I need to take into consideration? what would be the ideal speed for the strobe? (1/48th of a second?) How do I set exposure? Can it be done with an SRIII? Many questions. Thank you for any help.
1/48 in the strobe, doesn't match with the 24 fps, even that we set the photometer at 1/48sec. This is with the shutter on.
When the shutter is off , imagine that u will have a negetive running without anything to block the light off, wich means u will also have upper and down frames overlapse.
1/48 speed in the strobe means double flashes at your actuall speed.
1/24 is the more accurate but with even that u will have frame overlapse.
U see the stobe will continue light your frame, even that u see it flash!
The shutter blocks away all the light so that's why we have frames
Do your tests, maybe you will like the result and maybe this is what you re actually need, so why not go for it? I am sure you knew all this, it's just I am doing your check list.
As for the photometer reading, either use a flashmeter, or just a photometer.
Both will see the strobe, if you set the strobe rate 1/48 or above.
Upper and down side overlapse is definately what will happen.
Posted 12 September 2005 - 04:34 PM
Posted 12 September 2005 - 10:24 PM
If your strobe flashes for longer than 1/60 of a sec. and you wanted blurry images, then you may have to address the shutter issue, or use a camera that the shutter can open more than 180. I think Panavision 35 mm open to 210 or something like that.
However, the strobe will have to be synced to the camera so that the flash doesn't go off during the pulldown or you will get streaking. Or perhaps you may like occasional streaking.
You could also use a normal rock and roll strobe but it will not flash in sync with the camera. If you use a shutter it will roll in and out of sync with the shutter and expose brightly and then dim out to a point where it will get brighter again. And you may be exposing half or a quarter of the frame. See the end of Alien when Ripley tries to get in the shuttle to see strobes going in and out of sync with a shutter.
Another issue would be, is it worth the expense of taking out the shutter and having it put back in after the shoot. But that's up to you.
Like the man said. Test it!