The Photosonics 4ER High Speed Page
You have to keep a great deal in mind when picking
exposures for the high speed camera.
Here is how this chart works. At the frame rate indicated on the
left, you compensate your normal 24 fps exposure with the number under
the column called "Stop Comp w/BeamSplitter
So if you would have exposed an f4 at 24 fps and you want to shoot
at 90fps, you subtract 2.9 stops.
Basically, the shutter is typically at 120 degrees and the beam
splitter are the cause for the compensation.
As you can see, you also use up some film when you run at high
speed!
|
Frame Rate
|
X Speed
|
Exposure Time
|
Stop Comp w/ Beamsplitter
|
1000' Run Time
|
|
24 fps
|
1 X 24 fps
|
1/72
|
- 1.0 stop
|
11.10 Min
|
|
48 fps
|
2 X 24 fps
|
1/144
|
- 2.0 stop
|
5.50 Min
|
|
60 fps
|
3 X 24 fps
|
1/180
|
- 2.3 stop
|
4.40 Min
|
|
90 fps
|
4 X 24 fps
|
1/270
|
- 2.9 stop
|
2.96 Min
|
|
120 fps
|
5 X 24 fps
|
1/360
|
- 3.3 stop
|
2.22 Min
|
|
140 fps
|
6 X 24 fps
|
1/420
|
- 3.5 stop
|
1.90 Min
|
|
160 fps
|
7 X 24 fps
|
1/480
|
- 3.7 stop
|
1.66 Min
|
|
180 fps
|
8 X 24 fps
|
1/540
|
- 3.9 stop
|
1.48 Min
|
|
200 fps
|
8 X 24 fps
|
1/600
|
- 4.0 stop
|
1.33 Min
|
|
220 fps
|
9 X 24 fps
|
1/660
|
- 4.2 stop
|
1.21 Min
|
|
240 fps
|
10 X 24 fps
|
1/720
|
- 4.3 stop
|
1.11 Min
|
|
260 fps
|
11 X 24 fps
|
1/780
|
- 4.4 stop
|
1.02 Min
|
|
280 fps
|
12 X 24 fps
|
1/840
|
- 4.5 stop
|
57. Sec
|
|
300 fps
|
13 X 24 fps
|
1/900
|
- 4.6 stop
|
53. Sec
|
|
320 fps
|
13 X 24 fps
|
1/960
|
- 4.7 stop
|
50. Sec
|
|
340 fps
|
14 X 24 fps
|
1/1020
|
- 4.8 stop
|
47. Sec
|
|
360 fps
|
15 X 24 fps
|
1/1080
|
- 4.9 stop
|
44. Sec
|
The Photo-Sonics 4ER runs from 6 to 360 fps. It uses
a reflex viewing system with a Jurgens/Arri orientable viewfinder and a
shuttered video tap.
The 4ER uses an intermittent movement with 12 pull
down claws and 4 registration pins. There is a rotary disc type 120 degree
shutter that is adjustable in 5 degree increments (between 5 and 50 degrees
and 10 degrees between 50 and 120 degrees). The Aperture is .724 x .986
inches and will hold various ground glass types. The 4ER uses 1000 foot
magazines, BNCR or Panavision mounted lenses.
The hard part is that it requires 200-250 VAC Single
Phase 60 hz @ 35 amps.