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5 Specifications
461
5.4.5.2 Maximum Immersion Depth for Lenses
Some C-mount lenses reach deep into the camera flange. This may cause the lens to push against
the back of the filter glass inside the camera or even make it impossible to screw in the lens.
The table below indicates the maximum possible immersion depth for each DCx camera model.
The actual immersion depth of a lens is given in the relevant data sheet. As lens parts with a small
diameter are allowed to reach deeper into the camera flange, the immersion depths are specified
based on the diameter.
Beside the immersion depth also the back focal length has to be considered, that means the
distance between the last lens and the sensor (named "bfl" in the image below). The back focal
length can be calculated for C-mount with the following formula:
x stands for the maximum immersion depth (see table below).
Camera front (sectional view)
Note
Front Panel of the DCU223x / DCU224x housing
Models introduced before 2008 have a different front panel. On these models, the filter glass is
held in the C-mount lens connector by two screws. This front panel version is indicated by (V2) in
the table below.
resulting max.
immersion depth
(mm)
min. required back
focal length (mm)
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