80
•
Additional Reference Information
Falcon™ 4
-CLHS Series
Back Focal Variance when using any Filter
Inserting a filter between a lens and sensor changes the back focal point of the lens used. A
variable focus lens simply needs to be adjusted, but in the case of a fixed focus lens, the changed
focal point needs correction.
The following simplified illustration describes this but omits any discussion of the Optics, Physics,
and the math behind the refraction of light through glass filter media.
sensor surface
(focal plane)
Focal Point with
filter is behind
sensor surface
Filter
Illustration: Change of Focal
Point with inserted filter
Incident Light
(from Lens)
In this example when a glass filter is inserted between the lens and the camera sensor, the focal
point is now about 1/3 of the filter thickness behind the sensor plane.
Summary of Contents for Falcon 4-CLHS Series
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