5.Dimensions
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 85
5.2. Optical Interface
Figure 5-3 Optical interface of C-mount
MER-U3 cameras are equipped with C-mount lens adapters. The back-flange distance is 17.526 mm (in
the air). The maximum allowed thread length of lens should be less than 11.3mm, as shown in Figure 5-3.
The color models are equipped with an IR filter and the cut-off frequency is 700nm. The mono models are
equipped with a transparent glass. Remove IR-filter or transparent glass will defocus the image plane.
Contact our technical support when the glass needed to be removed.
5.3. Tripod Adapter Dimensions
When customizing the tripod adapter, you need to consider the relationship between tripod adapter, screw
length and step thickness of tripod adapter.
1) Screw length = tripod adapter step thi spring washer thi screwing length of camera
screw thread.
Figure 5-4 Schematic diagram of screw specification, tripod adapter step thickness and spring washer thickness
