P+S Technik Weisscam HS-1 Operator's Manual - Dop Stuff
DOP STUFF >> J|1
OPERATOR‘S GUIDE BOOK
DOP STUFF
Light
When shooting high speed at 1.000 fps a lot of light will be needed, no
matter if you do it on film or digital. The exact amount of light, depends
on the kind of shoot. So this is a decision for the DoP, he needs to
know, that the ASA is 160.
Flicker free
Never work with small lights like fluorescent Tubes, Kino Flo, Nessy
Light, Mini/ Maxi Brute, Dino Light, Dedo Light, small HMI or Tungsten
light sources. They normally flicker (Tungsten light is not flicker free !!!).
Work with 10K or 20K Tungsten. The size of the light bulb gives you
the security of not having a flickering in the image.
Regarding HMI: Work with 18K or mix 4 x 4 K´s to one main light. The
mixing of the 4K´s will eliminate their single flickering.
So far, there is no ballast, which gives you a guarantee, that the light is
100% flicker free, no matter if they are old or new.
An additional advantage of the WEISSCAM HS-1 is that you can see
and check the image on set in realtime, and see if there is a flickering
or not.
You will see flickering always on radiant backgrounds, flat and / or big
surfaces. If the flickering light is used as a top or a backlight, you may
not see it flickering. Sometimes it helps, to focus the bulb in the para-
bolic mirror inside the lamp.
HMI or Tungsten
HMI supports the sensor of the WEISSCAM HS-1 as the light contains
a great amount of blue, which is of advantage for the colors (CRI =
Color Rendering Index). A HMI lit set does not heat up as much as a
Tungsten lit set. But you still have to check the ballast and the flicker-
ing.
Tungsten light is less comforting for the sensor as the light contains a
huge amount of red, therefore making the CRI very poor. Also the set
becomes very hot. But you can be quite sure, that you will get a flicker
free shoot, if you are using 10 K’s.