... I'll be shooting 240fps on a FS700 for some nice slowmotion shots of people in a single, indoor area - however from tests I've done (with ambient + tungsten to replicate the venue) I've gotten some pretty terrible flickering.... Any ideas on what I could do to make this video the best it can be....
Another option is to convert the power supplying the indoor practicals and your movie lights to DC. Any tungsten lamp can operate DC as well as AC.
In response to a DP’s recent posting on the CML, where he was looking for some way to power a chandelier flicker-free for a high-speed commercial shoot shoot (pictured below), I built him a 120V AC to 120V DC power converter so that he could power the chandelier and other practicals flicker free at high speeds. He shot with it several weeks ago and reported that it “performed beautifully” and at “2,000fps was rock solid.”
The one I built for him could handle up to a 1000W tungsten load, but I have since scaled up the design to handle a Jr. with CXZ lamp. The larger converter (pictured here) will accept input AC voltages from 90-140V, and 190 – 250V and put out a constant 120V DC. It can operate at both 50 and 60 Hz. It also has a series LED display to indicate the total load put on it between multiple tungsten Fresnels and incandescent practicals.
And, as you can see in the picture above, it is a lot smaller and lighter and more easily concealed on a set than ten 12V deep cycle marine batteries, wired in series, which has been the traditional approach to powering tungsten lights with DC on stages.
Guy Holt, Gaffer, ScreenLight & Grip, Lighting and Grip Rental & Sales in Boston.