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Appendix B – Hyperfocal Distance
The hyperfocal distance is a distance beyond which all objects can be brought into an "acceptable" focus. It is
the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp.
Therefore the hyperfocal distance is the distance beyond which all objects are acceptably sharp, for a lens
when focused at infinity.
As the hyperfocal distance is the focus distance giving the maximum depth of field, it is the most desirable
distance to set the focus of a fixed-focus camera.
B.1 Hyperfocal Distance Table.
The hyperfocal distance of the Thermal Camera depends on the lens and sensor type selected, as
shown in the below tables:
Sensor: 384x288 (25µm)
Lens Type (mm)
15
18.5
25
45
Sensor: 640x480 (17µm)
Lens Type (mm)
15
18.5
25
45
Hyperfocal Distance (metres)
9
14
25
81
Hyperfocal Distance (metres)
13
20
37
120
Appendix B – Hyperfocal Distance
Operating Instructions
111
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