Read Sony SAL70200G2 Service Manual online
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
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