Mechanical dimensions
Page 51
Prosilica GB Technical Manual V2.2.6
C-Mount flange focal distance
Flange focal distance is the optical distance from the mounting flange to image
sensor die. Prosilica GB C-Mount cameras are optically calibrated to a standard
17.526 mm optical flange focal distance, with a ±10 µm tolerance.
Prosilica GB cameras are shipped with adjustable C-Mount.
Adjustment of C-Mount
The C-Mount is adjusted at the factory and should not require adjusting. If for
some reason the lens mount requires adjustment, use the following method.
Loosen locking ring
Use an adjustable wrench to loosen the locking ring. Be careful not to scratch the
camera. When the locking ring is loose, unthread the ring a few turns from the
camera face.
Adjusting the lens to infinity
Precondition: Use a C-Mount compatible lens that allows an infinity focus.
1. Set the lens to infinity and image a distant object (10 to 15 meters). Make sure
the lens is firmly threaded onto the C-Mount ring.
Figure 20: Prosilica GB camera front view
Lens tool - adjustment wrench
Contact the Allied Vision Sales team to purchase the hexagonal lens adjustment
wrench for Prosilica GB cameras with C-Mount locking ring (order code 02-5003A).
Locking ring
C-Mount ring
Locking wrench
