Sony SAL70400G Service Manual ▷ View online
4-4
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4-2.
APERTURE DIAMETER CHECK/ADJUSTMENT
Equipment
• Adhesive bond: (B-10)
4-2-1. Aperture Diameter Check
1.
Execute “LENS GENERAL ADJUSTMENT GUIDE 2. APERTURE DIAMETER CHECK”.
Specification: Aperture Tolerance: -25 to 0 (WIDE end: 70mm)
2.
If the aperture tolerance does not satisfy the specification, perform “4-2-2. Aperture Diameter Adjustment”.
4-2-2. Aperture Diameter Adjustment
1. Adjustment Procedure
1)
Remove the rear light shield barrel.
2)
Open the aperture as far as it goes by moving the preset lever and fix the aperture ring at the location where the aperture is open.
3)
Loosen two screws a little and move them right and left so that the operating lever of the preset ring can move right and left.
4)
While viewing the light source from the rear lens, move two screws right and left and tighten two screws at the position where the
blades of aperture are completely hidden by the neighboring frame.
5)
Perform “4-2-1. Aperture Diameter Check” and repeat steps 1) to 4) until the aperture tolerance satisfies the specification.
6)
After finishing the adjustment, apply the adhesive bond (B-10) to two screws which are tightened in step 4).
Signal Board
Rear Light
Shield Barrel
Shield Barrel
Aperture open position
Preset Lever
Two Screws
Apply the adhesive
bond (B-10)
bond (B-10)
Fig. 4-2-1
Fig. 4-2-2
4-5
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4-3.
OPTICAL AXIS CHECK/ADJUSTMENT
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
4-3-1. Optical Axis Check
1.
Execute “LENS GENERAL ADJUSTMENT GUIDE 3. Flange back (f’F)/Optical Axis Check”.
Specification
WIDE end
TELE end
CB
Less than 0.11 mm
Less than 0.15mm
Table 4-3-1
2.
In case that the CB of checking lens does not satisfy the specification, perform “4-3-2. Optical Axis Adjustment”.
3.
In case that the CB of checking lens satisfies the specification, perform “3. Adjustment Method 2 (WIDE end)” of “4-5-2. Focus-shift
/Flange Back (f’F) Adjustment”.
4-3-2. Optical Axis Adjustment
Check the optical axis. And if the value does not satisfy the specification, perform the optical axis adjustment.
1. Preparation
1)
Perform “4-3-1. Optical Axis Check” and confirm that the optical axis of the checking lens does not satisfy the specification.
2. Adjustment Method 1 (TELE end)
1)
Remove the rear light shield barrel and the light shield ring.
2)
Remove the 6th assy, insert the 6th tilt washer in between the 6th assy and the 6th adjustment washer and adjust.
Note:
Insert the 6th tilt washer in the CB direction.
3)
Install the 6th assy and tighten it with three screws.
Note:
• Return the 6th assy to the original position.
• Tighten the screws, starting with the location where the 6th tilt washer is inserted.
4-6
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4)
Perform “4-3-1. Optical Axis Check”. And if the value does not the specification, repeat steps 2) and 3) again.
Fig.4-3-1
6th tilt washer
Part No.
Thickness t (mm)
4-124-676-01
0.02
4-124-676-11
0.03
4-124-676-21
0.05
Table 4-3-2
3. Adjustment Method 2 (WIDE end)
1)
Replace the 2-6th assy.
2)
Perform “4-3-1. Optical Axis Check” and confirm that the value satisfies the specification.
3)
In case that the value satisfies the specification, perform “4-4-1. Projective Resolving Power Check”.
Three Screws
Light Shield Ring
6th Assy
6th Tilt Washer
6th Adjustment Washer
Signal Board
Rear Light
Shield Barrel
Shield Barrel
4-7
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4-4.
PROJECTIVE RESOLVING POWER CHECK/ADJUSTMENT
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
4-4-1. Projective Resolving Power Check
1.
Perform “LENS GENERAL ADJUSTMENT GUIDE 4. PROJECTIVE RESOLVING POWER CHECK”.
Specification
Focal length
Distance
Number of the smallest pitched lines/mm
f (mm)
(m)
Center (y’ = 0)
Neighborhood (y' = 15)
Neighborhood (y' = 18)
S
M
S
M
70
2.8
More than
200
8.0
100 lines
More than 50 lines
More than 50 lines
More than 40 lines
More than 40 lines
400
16.0
Table 4-4-1
2.
Confirm the projective resolving power. If the value does not satisfy the specification, perform “4-4-2. Projective Resolving Power
(Partial Blur)” Adjustment.
4-4-2. Projective Resolving Power (Partial Blur) Adjustment
Check the projective resolving power. If the value does not satisfy the specification, perform the projective resolving power adjustment.
1. Adjustment Method 1 (TELE end)
In case that the partial blur exists at the TELE end (f=400mm)
1)
Remove the 1st lens assy.
2)
Adjust the partial blur by increasing or decreasing the 1st tile adjustment washers between the 1st lens assy and the 1st adjustment
washer.
Note:
Insert the 1st tilt adjustment washer in the position of the back-focus tendency.
(When the 1st tilt adjustment washer is inserted in the position of the back-focus tendency, the inserted position tilts to the
front-focus side.)
Install the 1st lens assy to the original position.
When performing the partial blur adjustment, tighten the screws, starting with the location where the 1st tilt adjustment
washer is inserted.
Ver. 1.2 2009.02
The changed portions from
Ver. 1.1 are shown in blue.
Ver. 1.1 are shown in blue.
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