Read Sony SAL70200G2 Service Manual online
5-5
SAL70200G2 (2.8/70-200 G SSM Ⅱ) (70-200mm F2.8 G SSM II)
2. Adjustment procedure
1) Loosen the nine screws that tighten the aperture hold ring.
2) Open the aperture and rotate the aperture hold ring. Then, adjust so that the aperture blades are hidden behind the aperture hold ring.
3) Tighten the nine screws, apply the adhesive bond (B-10) to three locations (two interval) at A parts (head of screw).
4) Apply the adhesive bond (B-10) to nine locations at B parts (tip of screw).
1) Loosen the nine screws that tighten the aperture hold ring.
2) Open the aperture and rotate the aperture hold ring. Then, adjust so that the aperture blades are hidden behind the aperture hold ring.
3) Tighten the nine screws, apply the adhesive bond (B-10) to three locations (two interval) at A parts (head of screw).
4) Apply the adhesive bond (B-10) to nine locations at B parts (tip of screw).
Apply the adhesive bond (B-10)
B parts (Tip of screw) (Nine locations)
Apply the adhesive bond (B-10)
A parts (Head of screw) (Three locations) (Two interval)
Aperture Blade (Nine pieces)
Aperture Hold Ring
Fig.
5-2-9
5) Assemble the lens completely, perform 5-2-1. Aperture Diameter Check .
Note:
Perform 5-2-2. Aperture Diameter Adjustment and 5-2-1. Aperture Diameter Check until the aperture tolerance meets the specification.
5-3. 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)
• Adhesive bond (B-10)
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50 mm)
• Adhesive bond (B-10)
1. Preparations
1) Set the equipment as shown in the Fig. 5-3-1.
Flange back gauge (43.50 mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Fig.
5-3-1
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. 5-3-2 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.
5-3-2
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.
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