Manual

Prosilica GB Technical Manual V2.0.5
28
Mechanical drawings
Optical flange focal distance
Optical flange focal distance is the optical distance from the mounting flange to
the image sensor die (see figure 15). Optical flange focal distance can be calcu-
lated as:
Figure 15: Cross section of typical Prosilica GB front assembly with C-Mount
Camera Sensor orientation Lens protrusion
[mm]
IR cut filter*
[mm]
Sensor window
[mm]
Nominal flange focal
distance [mm]
GB650C Landscape 8.88 1.00 0.76 18.11
GB650C Portrait 9.27 1.00 0.76 18.11
GB650 Landscape 13.64 0.00 0.75 17.78
GB650 Portrait 13.64 0.00 0.75 17.78
GB660C Landscape 8.41 1.00 0.75 18.11
GB660 Landscape 13.64 0.00 0.75 17.78
GB1380C Landscape 8.88 1.00 0.75 18.11
GB1380C Portrait 9.32 1.00 0.75 18.11
GB1380 Landscape 13.64 0.00 0.75 17.78
GB1380 Portrait 13.64 0.00 0.75 17.78
GB2450C Landscape 8.29 1.00 0.50 18.03
GB2450 Landscape 13.64 0.00 0.50 17.69
* Only color camera models are equipped with IR cut filter.
Table 10: Flange focal distance and maximum lens protrusion for Prosilica GB cameras with C-Mount
Optical flange focal distance Flange focal distance
IR cut filter thickness Sensor window thickness+
3
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

–
A
A
Flange focal distance
Max. lens protrusion
IR cut filter thickness Sensor window thickness
Section A-A
Image sensor die