Question
What Size Patterns Do Source Fours Use and What Are The Image Diameters and Focal Lengths?
Answer
Source Four uses "A" and/or "B" size patterns and Source Four jr uses "M" size patterns.
| Type |
Outer Diameter |
Max Image Diameter |
| A |
3.93"/100mm |
2.95"/75.0mm |
| B |
3.38"/86mm |
2.53"/64.5mm |
| M |
2.57"/65.5mm |
1.94"/49.5mm |
The gate size in a Source Four is 3.12"/79.24mm.
The gate size in a Source Four jr is 2.15"/54.61mm.
Focal Length Source Four:
|
90 degree
|
2.13"/54.1mm
|
|
70 degree
|
2.67"/67.82mm
|
|
50 degree
|
3.3"/83.82mm
|
|
36 degree
|
4.8"/121.92mm
|
|
26 degree
|
6.8"/172.72mm
|
|
19 degree
|
9.3"/236.22mm
|
|
14 degree
|
11.05"/280.67mm
|
|
10 degree
|
17.8"/452.12mm
|
|
5 degree
|
25.5"/647.70mm
|
Focal Length Source Four jr:
| 26 degree |
4.66"/118.3mm |
| 36 degree |
3.27"/83.18mm |
| 50 degree |
2.33"/59.18mm |
| Fixture |
Actual Field Angle (per 7/2003 testing) |
Lens Focal Length |
| S4 15-30 |
16.2° minimum |
278mm |
| 31.3° max |
141mm |
| S4 25-50 |
26.9° minimum |
166mm |
| 49.0° max |
87mm |