Sony SAL70200G (serv.man2) Service Manual ▷ View online
5-25
SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
3. Optical Axis Adjustment
1)
Push the 1 group ball frame tube block to reduce the gap or play.
a.
While observing the collimator, confirm the direction where the CB occurs.
b.
Push the 1 group ball frame tube block in the direction of CB.
c.
Observe the collimator again and confirm the optical axis.
Fig.5-4-6
2)
If the result in step 1) does not meet the specification, push the 5 group ball frame block to reduce the gap or play.
a.
Disassemble up to outer barrel.
b.
Push the 5 group ball frame tube block in the opposite direction where the CB occurs.
Fig.5-4-7
G1 Holding Rubber
1 Group Ball Frame Tube Block
G1 Holder Ring
5 Group Ball Frame Block
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SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
3)
If the result does not meet the specification in steps 1) and 2), push the 1 group ball frame tube block to reduce the gap or play again.
4)
When the optical adjustment is completed, make the marking-off on the bore of mirror tube block and outer diameter of 1 group ball
frame tube block (G3 riveting tube block).
Note:
When making the marking-off, remove the G1 lens and the G2 lens.
Fig.5-4-8
Mirror Tube Block
G3 Riveting Tube Block
G1
G2
1 Group Ball Frame Tube Block
G1 Holder Ring
Make the marking-off on the outer diameter
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SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
4. Flange Back (f'F) Check
Note:
Note:
When measuring or adjusting the flange back (f'F), touch the focus and the zoom as shown below.
Zoom
200
Be sure to rotate from “135” to the WIDE side and touch slowly.
70
Be sure to rotate from “100” to the TELE side and touch slowly.
Focus
∞
Rotate from 3m to the near end and touch slowly to the over infinity stopper. (Do not slip it.)
1)
Set the focal length of lens to be measured to the WIDE end “70mm”.
2)
Set the focus of lens to be measured to the infinity end.
3)
Confirm the flange back (f'F) value at the focal length WIDE end “70 mm”.
4)
Set the focal length to the TELE end “200mm” and confirm the flange back (f'F) value.
Flange back (f'F) value of checking lens =
(Value of flange back gauge for SR) + (Number of rotation of short pointer) + (Scale of long pointer).
Specification
Focal Length f(mm)
Flange back value (mm)
Flange back value f'F(mm)
Over infinity (Touching to the infinity side)
Optical infinity (L index)
Difference from over infinity
Difference from over infinity
200
46.59
± 0.07 (46.52 to 46.66)
-1.99
70
44.87
± 0.07 (44.80 to 44.94)
Table 5-4-2
5)
Rotate the knob of microscope and set the dial gauge to the value below.
Flange back (f'F) value at the focal length TELE end “200mm” over infinity - 1.99 (mm)
6)
Rotate the mirror tube block so that it is in focus.
Confirm that L index is in the range shown below.
Fig.5-4-9
7)
If not met the specification in the steps up to 6), after implementing the “5-4-2. Focus-Shift (Focal Length) Check/Adjustment”,
perform the “5-4-3. Flange back (f'F) Adjustment”.
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SAL70200G (2.8/70-200 G) (70-200mm F2.8 G)
5-4-2. Focus-Shift (Focal Length) Check/Adjustment
In this section, the procedure to adjust the focus change occurred when changing the focal length is described.
Equipment
• 1000mm collimator
• Flange back measuring equipment
• A-mount attachment
• Flange back gauge (43.50mm)
1. Preparation
Perform the “1. Preparation” of “5-4-1. Optical Axis Check/Adjustment and Flange back (f'F) Check”.
2. Check/Adjustment Procedure
1)
Set the focal length of lens to be measured to the TELE end “200mm”.
2)
Set the focus of lens to be measured to the infinity end.
3)
Set to the focal length to the TELE end “200mm” and confirm the flange back (f'F) value.
4)
Set to the focal length to the WIDE end “70mm” and confirm the flange back (f'F) value.
5)
Calculate the results obtained in steps 3) and 4) using the formula below and determine the amount of focus point movement
adjustment washer.
Amount of focus point movement adjustment washer (mm) =
{
(46.59 - (Tele end f'F)
)
- (44.87 - (Wide end f'F)
)}
/ - 0.86
When the amount of focus point movement adjustment washer is positive value (+):
Make the focus point movement adjustment washer thicker.
When the amount of focus point movement adjustment washer is negative value (-):
Make the focus point movement adjustment washer thinner.
Specification
Focal Length f(mm)
Focus-shift (mm)
70 to less than 135
-0.1 to +0.1
135 to 200
-0.15 to +0.1
Table 5-4-3
6)
Corresponding to the result of focus point movement adjustment washer amount, increase or decrease the focus point movement
adjustment washer.
Focus Point Movement Adjustment Washer
Part No.
Description
thickness(mm)
2-691-553-01
Focus Point Movement Adjustment Washer A
0.05
2-691-554-01
Focus Point Movement Adjustment Washer B
0.07
2-691-555-01
Focus Point Movement Adjustment Washer C
0.1
2-691-556-01
Focus Point Movement Adjustment Washer D
0.2
2-691-557-01
Focus Point Movement Adjustment Washer E
0.5
Table 5-4-4
Ver. 1.5 2010.01
The changed portions from
Ver. 1.4 are shown in blue.
Ver. 1.4 are shown in blue.
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