Read Sony SAL2470Z2 Service Manual online
4-6
SAL2470Z2 (Vario-Sonnar 2.8/24-70 ZA SSM II) (Vario-Sonnar T* 24-70mm F2.8 ZA SSM II)
2. Adjustment Procedure
1) Rotate the aperture block from the lens front so that the aperture blades are hidden behind the aperture hold ring. (Fig.4-2-9)
2) Remove the maximum aperture jig once. Then, install the maximum aperture jig again and confirm the position of aperture blades.
3) Confirm the aperture tolerance. Repeat the confirmation and adjustment until the aperture tolerance meets the specification.
4) After completing the adjustment, apply the adhesive bond (B-10) to the four indicated locations (width in 10 mm). (Fig.4-2-9)
1) Rotate the aperture block from the lens front so that the aperture blades are hidden behind the aperture hold ring. (Fig.4-2-9)
2) Remove the maximum aperture jig once. Then, install the maximum aperture jig again and confirm the position of aperture blades.
3) Confirm the aperture tolerance. Repeat the confirmation and adjustment until the aperture tolerance meets the specification.
4) After completing the adjustment, apply the adhesive bond (B-10) to the four indicated locations (width in 10 mm). (Fig.4-2-9)
Aperture Block
Aperture Hold Ring
Aperture Hold Ring Spring
Apply the adhesive bond (B-10)
Apply the adhesive bond (B-10)
Fig.
4-2-9
4-3. OPTICAL AXIS CHECK/ADJUSTMENT
Setting of the Flange Back (f F) measuring instrument.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
4-3-1. Preparations
1) Set the equipment as shown in the Fig. 4-3-1.
Flange back gauge (43.50mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Fig.
4-3-1
2) Looking through the eyepiece lens, turn the eyepiece ring of the flange back tester so that cross line or scale in the view is the sharp-
est.
3) Attach the flange back gauge (43.50 mm) securely to the A-mount attachment and hold them together.
4) Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50 mm) is the sharpest.
4) Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50 mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig. 4-3-2 for correct reading.
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction for correct reading.
Fig.
4-3-2
5) Turn the scale ring of the dial gauge until the long pointer indicates 0 .
Note:
This position is the flange back (f F) = 43.50 mm.
Memorize the position of short-pointer.
4-3-2. Optical Axis Check/Adjustment
1) Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
Note:
When attach the checking lens to the flange back tester, remove the rear light shield barrel.
1000 mm collimator
Checking lens
Fig.
4-3-3
2) Set the focus ring of the checking lens to
∞
(infinity) index or near
∞
(infinity) and adjust the optical axis, observing the microscope
so that the chart can be seen in the center.
3) Turn the focusing knob of the flange back tester until the chart image comes into focus.
Also check the optical axis aligns with the chart center. (Refer to Fig. 4-3-4.)
Note:
Note:
Figure shows example. The cause depends on individual lens.
Optical Alignment
Best alignment
Best alignment
Incorrect aligned
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
Fig.
4-3-4
4) If the optical axis aligns the most unsharp, rotate the 4th lens assy and adjust the optical axis.
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