Sony SAL70200G (serv.man2) Service Manual ▷ View online
5-30
SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
5-4-3. Flange Back (f'F) Adjustment
Equipment
• 1000mm collimator
• Flange back measuring equipment
• A-mount attachment
• Flange back gauge (43.50mm)
Note:
Perform the flange back (f'F) adjustment after competing the “5-4-2. Focus-Shift (Focal Length) Check/Adjustment”.
1. Preparation
Perform the “1. Preparation” of “5-4-1. Optical Axis Check/Adjustment and Flange back (f'F) Check”.
2. Adjustment Procedure
1)
Set the focal length of lens to be measured to the WIDE end “70mm”.
2)
Set the focus of lens to the infinity.
3)
Confirm the flange back value (f'F) at the focal length WIDE end “70mm”.
4)
Calculate the results obtained in steps 3) using the formula below and seek the flange back correction value.
Flange back correction value (mm) = flange back value (f'F) at the focal length Wide end “70mm” Over infinity - 44.87 mm
When the flange back correction value is positive (+): Make the back adjustment washer thicker.
When the flange back correction value is negative (-): Make the back adjustment washer thinner.
Back Adjustment Washer
Part No.
Description
thickness(mm)
2-691-806-01
Back Adjustment Washer A
0.05
2-691-807-01
Back Adjustment Washer B
0.07
2-691-808-01
Back Adjustment Washer C
0.10
2-691-809-01
Back Adjustment Washer D
0.20
2-691-810-01
Back Adjustment Washer E
0.50
Table 5-4-5
6)
Assemble the back adjustment washer and perform the “4. Flange back (f'F) Check” of section 5-4-1 again and confirm that the value
meets the specification.
Fig.5-4-11
Lean the outer tube block and
insert the back adjustment washer
as shown in figure.
insert the back adjustment washer
as shown in figure.
Back Adjustment Washer
Loosen the four screws
Outer Tubu Block
Connect Barrel Unit
5-31
SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
5-5.
FOCUS-SHIFT CHECK/ADJUSTMENT (APERTURE (AMOUNT OF SPHERICAL
ABERRATION))
ABERRATION))
This section describes the check/adjustment of focus-shift amount resulting change of focal-length by aperture setting.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Aberration measuring cap 77mm (SAL70200G)
1. Preparations
1)
Perform “1. Preparations” of “5-4-1. Optical Axis Check/Adjustment and Flange Back (f’F) Check”.
2)
Set the checking lens focus to the infinity.
3)
Set the focal length 200mm.
2. Checking Method
1)
Set the lens aperture to the open aperture position, and measure the flange back (f’F).
2)
Set the aberration measuring cap 77mm on the tip of lens as shown in the Fig.5-5-1, then measure the flange back (f’F).
Fig.5-5-1
3)
Calculate amount of focus-shift using the following formula, and check that the specification is satisfied.
Note:
The focus-shift amount of the checking lens is difference between the flange back (f’F) of open aperture and flange back
(f’F) reading (using aberration measuring cap 77mm).
Focus-shift = Flange back (f’F) reading (using aberration measuring cap 77mm) - flange back (f’F) of open aperture reading
Specification
Focus-shift (mm) = – 0.1 to +0.14
4)
According to the result of the focus-shift, and replace the DM PC board unit.
DM PC Board Unit Distinction Method
Focus-shift
Part No.
Distinction method
0 to +0.1
1-480-056-21
Marking of microcomputer: It is not.
-0.06 to -0.01
1-480-056-31
Marking of microcomputer: 1
-0.1 to -0.07
1-480-056-41
Marking of microcomputer: 2
Table 5-5-1
Aberration measuring cap 77mm (SAL70200G)
5-32
SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
5-6.
ZOOM BRUSH POSITION ADJUSTMENT
Equipment
• Personal Computer (PC)
• Finished Inspection JIG (AC100 V only)
• Lens Adjustment Program (Actuator Checker)
1. Preparations
1)
Remove parts indicated in Fig.5-6-1 from the lens unit.
Fig.5-6-1
2)
Connected to equipment with checking lens. (Refer to Fig. 5-1-25 of Section 5-1-3.)
3)
Start up of “ActuatorChecker.exe”.
4)
Click
[Set up]
, and perform the initial setting. (Refer to Section 5-1-4.)
Zoom Rubber Ring
Polyester Tape (Black) 10mm
Polyester Tape (Black) 10mm
Brush cover
5-33
SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
2. Adjusting Method
1)
Set the zoom to “TELE end”.
2)
Adjust the position of brush so that the curved part of brush comes to the cut portion marked with
O on the zoom encoder flexible.
Fig.5-6-2
3)
Click the
[Search Zoom Adj. Point].
Fig.5-6-3
Note:
Adjust the brush in the right or left direction. At this moment, work with caution for the brush not to drop with its own
weight by shock when touching to the zoom.
R part of brush (zoom)
Zoom Encorder Flexible
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