• Source Four Pattern Sizes, Image Diameters and Focal Lengths

    The Source Four uses "A" and/or "B" size patterns and Revolution and Source Four Jr uses "M" size patterns.

    typeouter diametermax image diameter
    A    3.93"/100mm2.95"/75.0mm
    M  2.57"/65.5mm1.94"/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 

    FixtureActual Field Angle (per 7/2003 testing)Lens Focal Length
    S4 15-3016.2° minimum278mm
    31.3° max141mm
    S4 25-5026.9° minimum  166mm
    49.0° max87mm