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Camera dimensions
OSCAR Technical Manual V2.4.0
34
Adjustment of C-Mount
Oscar cameras allow the precise adjustment of the back focus of the C-Mount
by means of a back focus ring which is threaded into the C-Mount and held
by two screws on either side of the camera. The mechanical adjustment of
the imaging device is important in order to achieve a perfect alignment with
the focal point of the lens.
This adjustment is made before leaving the factory to conform to the stan-
dard of 17.526 mm and should normally not require adjustment in the field.
However, if the back focal plane of your lens does not conform to the C-
Mount back-focus specification, renewed adjustment may be required in the
field.
How to proceed:
1. Loosen screws (location as shown above by arrow) with an Allen key
(1.3 x 50; Order#: K 9020411).
2. With the lens set to infinity or a known focus distance, set the camera
to view an object located at 'infinity' or the known distance.
3. Rotate the C-Mount ring and lens forward or backwards on its thread
until the object is in sharp focus. Be careful that the lens remains
seated in the C-Mount.
4. Once focus is achieved, tighten the two locking screws without applying
excessive torque.
Figure 10: Back focus adjustment