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Aperture Diameter Check/Adjustment - Sony SAL20F28 Service Manual

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4-2.

APERTURE DIAMETER CHECK/ADJUSTMENT

4-2-1. Aperture Diameter Check
Note:
Perform the aperture diameter check in the state of the Fig.4-2-1 (only the decoration ring was removed), or completion of
assembling.
Decoration Ring
Fig.4-2-1
Equipment
• Luminance Box
• Camera DSLR-A100
• AE Master Lens
• Compact Flash (CF) Card (For image saving)
• Personal Computer (PC)
(Color Calculator 2 installed)
1. Preparations
1) Install the CF card to the camera.
2) Set the equipments, camera and master lens as shown in Fig.4-2-2.
Luminance box
Luminance: EV12
3) Shoot the images under the following conditions and save them.
Note: Shoot the center of the luminance surface three times with the master lens and checking lens.
Setting of Luminance box:
Luminance:
Setting of Lens:
SAL20F28 (2.0/28) (20mm F2.8)
Shoot the center of the luminance surface
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
Focus: Infinity end
Fig.4-2-2
EV12
Focus:
Setting of Camera:
ISO:
Exposure Mode:
shutter Speed:
Aperture:
Focus Mode:
Metering:
Preset white balance: Tungsten
D-R:
4-4
Infinity end
100
M
1/125
F5.6
MF
Center weighted
OFF

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