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KnowledgeBase: What Size Patterns Do Source Fours Use and What Are The Image Diameters and Focal Lengths?

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First published by:
Kelsey Aleckson
on 06-25-2009
Last revision by:
Tracy.Fitch
on 11-05-2010
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KnowledgeBase: What Size Patterns Do Source Fours Use and What Are The Image Diameters and Focal Lengths? This page is locked to prevent further edits

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

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