Sony SAL70200G2 Service Manual ▷ View online
5-2
SAL70200G2 (2.8/70-200 G SSM Ⅱ) (70-200mm F2.8 G SSM II)
5-1-2. Check/Adjustment Order
Optical System
5-2-1. Aperture
Diameter Check
OK
OK
OK
OK
OK
NG
NG
NG
OK
NG
NG
NG
NG
5-3-1. Optical Axis Check
5-5-1. Flange Back (f'F)
Check
5-6. FOCUSING
ERROR AMOUNT
CHECK
OK
NG
5-2-2. Aperture
Diameter Adjustment
5-5-2. Focus-Shift
(Focal Length)
Check/Adjustment
5-5-3. Flange Back
(f'F) Adjustment
5-4-2. Projective Resolving
Power Adjustment
(One Side Blur Adjustment)
OK
OK
OK
NG
5-4-1. Projective
Resolving Power Check
5-3-2. Optical Axis
Adjustment
5-10. FINISHED
ADJUSTMENT/
INSPECTION
Effective lens of
amount of spherical
aberration (Note)
OK
5-9. ULTRASONIC
MOTOR HEIGHT CHECK
Drive System
(Half-Completion Inspection,
Finished Inspection)
5-8-1. Focus Brush
(A Encoder Brush)
Position Checking
NG
5-8. HALF
COMPLETION
ADJUSTMENT/
INSPECTION
NG
5-8-2. MR Checking
OK
OK
NG
5-10-1. Zoom Brush
Position Checking
5-10-2. Focusing Error
Amount Adjustment
(Write
⊿SB)
END
5-9. ULTRASONIC
MOTOR HEIGHT
Adjustment
5-8-1. Focus Brush
(A Encoder Brush)
Position Adjustment
5-8-2. MR Adjustment
5-10-1. Zoom Brush
Position Adjustment
Note: Effective lens of amount of spherical aberration
5 Group Ball Frame Block
(A-1962-238-A)
(A-1962-238-A)
Replace the following lens assembly.
5-3
SAL70200G2 (2.8/70-200 G SSM Ⅱ) (70-200mm F2.8 G SSM II)
5-2. APERTURE DIAMETER CHECK/ADJUSTMENT
5-2-1. Aperture Diameter Check
Equipment
• Luminance Box
• Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
• AE Master Lens
• Memory Card
• Personal Computer (Color Calculator 2 installed)
• Luminance Box
• Camera (One of DSLR-A700, SLT-A37/A57/A58/A65/A77/A99)
• AE Master Lens
• Memory Card
• Personal Computer (Color Calculator 2 installed)
1. Preparations
Note:
Confirm the checking lens by complete.
1) Install the memory card to the camera.
2) Set the equipment, camera and AE master lens as shown in Fig. 5-2-1.
2) Set the equipment, camera and AE master lens as shown in Fig. 5-2-1.
Luminance box
Luminance: EV12
Luminance: EV12
Camera
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: Tungsten
D-R: OFF
Master lens or checking lens
Zoom: Wide end (focal length: 70 mm)
Focus: Infinity end
Zoom: Wide end (focal length: 70 mm)
Focus: Infinity end
Shoot the center of the luminance surface
Fig.
5-2-1
3) Shoot the images under the following conditions and save them.
Note:
Shoot the center of the luminance surface three times with the AE master lens and checking lens.
Setting of Luminance box:
Luminance:
EV12
Setting of Lens:
Zoom:
WIDE end (focal length: 70 mm)
Focus:
Infinity end
Setting of Camera:
ISO:
100
Exposure Mode:
M
Shutter Speed:
1/125
Aperture:
F5.6
Focus Mode:
MF
Metering:
Center weighted
Preset white balance:
Tungsten
D-R:
OFF
2. Checking of Image
Note:
Check the image of both AE master lens and checking lens.
1) Start the Color Calculator 2.
Fig.
5-2-2
2) Read the image from the file menu.
⇒
Fig. 5-2-3
3) Set the Color Calculator 2 as follows.
Measured value display (Display menu): RGB+L*a*b*
Measuring method (Display menu):
Center Single Area
Fig.
5-2-4
Color space (Edit menu): sRGB
Fig.
5-2-5
Area size for calculate (Edit menu
→
Option): 256
×
256 Pixels
Fig.
5-2-6
5-4
SAL70200G2 (2.8/70-200 G SSM Ⅱ) (70-200mm F2.8 G SSM II)
4) Click the Calculate button to measure the image.
5) After measuring, check the G values.
Average
5) After measuring, check the G values.
Average
G value of the three images shoot with master lens:
(a)
Average
G value of the three images shoot with checking lens: (b)
Calculate button
Check the “G” value
Fig.
5-2-7
3. Checking Method
1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.
1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.
Aperture error = Average G value of checking lens (b) - Average G value of master lens (a)
Specification:
Aperture error = -25 to +0 (WIDE end: 70 mm)
2) When the aperture error is out of specification, perform 5-2-2. Aperture Diameter Adjustment .
5-2-2. Aperture Diameter Adjustment
Equipment
• Adhesive bond (B-10)
• Maximum Aperture jig
•
• Adhesive bond (B-10)
• Maximum Aperture jig
•
Universal Wrench
• Chip-A for Universal Wrench
• Chip-B for Universal Wrench
• Chip-C for Universal Wrench
• Chip-B for Universal Wrench
• Chip-C for Universal Wrench
1. Procedure
1) Disassemble or assemble the lens as shown in Fig. 5-2-8.
1) Disassemble or assemble the lens as shown in Fig. 5-2-8.
(Remove the parts of forward (object side) from the aperture blade, perform in the condition the lens is seen.)
2) Install the maximum aperture jig and open the aperture.
Fig.
5-2-8
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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