5-10
SEL24105G
5-2-2. Optical Axis Check
Checking Procedure
1. Adjust the optical axis while observing the microscope until the
chart image can be seen in the center.
2. Perform steps (1) to (6) and check that the AS and CB values are
within specifications.
AS
(Astigmatism):
The phenomenon where the flare on the ring chart appears in a
cruciform shape with the ring chart in the sharpest focus. (Fig. a)
(1) Turn the focusing knob until the flare becomes minimum
between two approximately opposite points on the ring
chart edge (as shown with the arrows in Fig. b), and then
read the dial gauge value. <A>
(2) Turn the focusing knob until the
fl
are becomes minimum
between two points with the phase of the
fl
are rotated by 90
degrees from the above step (1) condition (as shown with
two arrows in Fig. c), and then read the dial gauge value.
<B>
(3) Calculate the AS value (absolute difference between <A>
and <B>) and check that it is within the speci
fi
cation.
AS value = <A>
−
<B>
(1)
(1)
(2)
(2)
AS
(Fig. a)
(Fig. b)
(Fig. c)
CB (Center Blur):
The phenomenon where the flare on the ring chart trails in one
direction with the ring chart in the sharpest focus. (Fig. d)
(4) Turn the focusing knob until the ring chart edge in the direc-
tion of the maximum
fl
are is in the sharpest focus (as shown
with the arrow in Fig. e), and then read the dial gauge value.
<C>
(5) Turn the focusing knob until the ring chart edge, opposite
180 degrees from the above step (4) condition (as shown
with the arrow in Fig. f) is in focus, and then read the dial
gauge value. <D>
(6) Calculate the CB value (absolute difference between <C>
and <D>) and check that it is within the speci
fi
cation.
CB value = <C>
−
<D>
(5)
(4)
(Fig. d)
(Fig. e)
(Fig. f)
CB
Speci
fi
cation (Reference):
AS (Astigmatism)
0.09 mm or less
CB (Center Blur)
0.13 mm or less
3. If the specifications of AS and CB are not satisfied, perform the
“5-2-3. Optical Axis Adjustment”.
5-2-3. Optical Axis Adjustment
Optical Axis Adjustment is done by moving the 3th group assy
in the 3-5th group assy.
Adjustment Procedure
1. Remove the zoom ring rubber and the guard tape Z, referring to
the “2-2. DISASSEMBLY”.
2. Attach the checking lens to the flange back tester referring to
the steps 1 to 3 of “Preparations of Using a Camera (General
Emount Interchangeable Lens Digital Camera)” or “Preparations
of Using a B-L Control Box”, set the 1000 mm collimator.
3. Set the zoom to the TELE end.
4. That the ring chart image becomes the center while observing the
1000 mm collimator so insert a thin flathead screwdriver to the
hole of the lens side and turning the adjuster pin (three places)
little by little.
Look at the state of the optical axis, look at the state of the optical
axis to turn again if misalignment, repeat the procedure.
5. Perform the “5-2-2. Optical Axis Check”, check that the optical
axis of checking lens satisfies the specification.
6. When the specification (reference value) is satisfied, remove the
appearance assy, referring to the “2-2. DISASSEMBLY”.
7. Apply the adhesive bond (B-110) to the following 6 places.
B-110
B-110
