Read Sony SAL28F28 Service Manual online
4-14
SAL28F28 (2.8/28) (28mm F2.8)
4-4-2. Flange Back (f’F) Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Adhesive bond (B-10)
Adjusting Method
1)
Disassemble or assemble the checking lens into the state of Fig.4-4-5.
Fig.4-4-5
2)
Perform “4-4-1. Flange Back (f’F) Check”, and check that the flange Back (f’F) of the checking lens is out of specification of the
Table 4-4-1.
3)
Turn the focusing knob of the tester until the flange back (f’F) of the checking lens is “44.56 mm”.
Note:
When turning the focusing knob of the tester, chart image check is not required.
4)
Turn the focus ring of the checking lens until red and green color areas are equal on the chart while looking through the microscope.
Note:
If in-focus point cannot be obtained even through the focus ring is fully turned, perform the following steps (1) to (4) and
shift the position of the focus ring. (Refer to Fig.4-4-6.)
(1) Set the focusing ring to the infinity stop position, and hold the focus ring.
(2) Loosen the six screws fixing the focus ring fastening plate.
(3) Turn the helicoid in the direction of the arrow (screw in direction), and tighten the six screws loosened in step (2) tentatively.
(4) Perform the step 4) again.
Fig.4-4-6
G1 Stopper
Mirror Tube Block
Focus Ring Fastening Plate
Focus Ring
Screw
Screw
Screw
Screw
Screw
Screw
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