Pattern Sizes, Image Diameters, and Focal Lengths in Source Four Fixtures
The Source Four uses "A" and/or "B" size patterns and Revolution 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:
50 degree = 3.3"/83.82mm
36 degree = 4.8"/121.92mm
26 degree = 6.8"/172.72mm
19 degree = 9.3"/236.22mm
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 |