SAL70200G2 - Sony Digital Camera Service Manual (repair manual). Page 37

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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)
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.
Luminance box
 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
Master lens or checking lens
 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

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