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The flange focal length is the distance from the flange (mounting surface) of a lens to the focal plane.
If the focal plane of the lens does not coincide with the image plane of the camera, the object will be out of focus
during a zoom operation.
In this case, make an adjustment as follows:
When the camera has a flange focal length adjustment mechanism
Referring to the operation manual of the camera, adjust the flange focal length using the camera's flange focal
length adjustment mechanism.
When the lens is adjusted for a camera that has a flange focal length adjustment mechanism, the lens may not
perform as originally designed.
When the camera does not have a flange focal length adjustment mechanism
Using the procedure below, use the flange focal length adjustment mechanism of the lens to adjust the flange
focal length.
Tools required:
Allen wrench (1.5 mm width): Used for the flan ge focal length fixing screws
Allen wrench (2.0 mm width): Used for the flan ge focal length adjustment
For the positions of the flange focal length fixing screws and hexagonal holes
used for the flange focal length adjustment, refer to the illustration below.
Flange focal length adjustment mechanism of the lens
【
Hexagonal holes (2 mm)
for the flange focal length adjustment
Flange focal length fixing screw (1.5 mm)
1. Set the power switches of the devices to ON, and prepare to check the images on the monitor.
2. Set the lens iris to open, and shoot a subject that is at least M.O.D. (3 meters) away from the camera.
Note:
If the flange focal length is adjusted with the iris stopped down, the focus may be less sharp when
the iris is open, so the iris must always be set to open before the adjustment is performed.
Note:
For the subject, use a chart with sharp contrast such as the Siemens chart that is provided at the
end of this manual.
ADJUSTMENT OF FLANGE FOCAL LENGTH
】
LENS
- 15 -
CAMERA
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