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The flange focal length is the distance from the flange (mounting surface) of a lens to the focal plane.
Depending on the camera or conditions such as ambient temperature, there may be a case where the back focus is
changed.
If this occurs, perform the adjustment according to the following procedure.
■ CONDITIONS OF OBJECT AND DIAPHRAGM
1. Object:
2. Distance of Object:
3. Diaphragm:
■ ADJUSTMENT
For the operation of focus and zoom, refer to pages 7 and 8.
a. Loosen the F.f locking screw by rotating it counterclockwise using the accessory tool.
b. Operate the zoom to set it to the wide end.
c. Rotate the F.f adjusting ring to focus on the Siemens Star located approximately 3 meters away.
The position where the radial black and white lines become sharpest is the optimum focus position.
d. Operate the zoom to set it to the telephoto end.
e. Operate the focus to bring the object into focus.
f. Operate the zoom to set it to the wide end again, and check that the optimum focus position adjusted in step 'c'
is kept.
g. To adjust precisely, repeat the above steps 'b' through 'f' several times.
(If the most optimum focus position usually holds in all zoom areas, the flange focal length is adjusted
precisely. If it is not focused, the flange focal length is not adjusted sufficiently. In this case, start adjusting
again from step 'b.')
h. Finally tighten the F.f locking screw firmly using the accessory tool.
ADJUSTMENT OF FLANGE FOCAL LENGTH
cut out the "Siemens Star" chart at the back of this manual and use it as the object
about 3 meters
open or as near to open as possible
F.f ADJUSTING RING
F.f LOCKING SCREW
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