Aperture Diameter Check/Adjustment - Sony SAL1870 Service Manual

Ver. 1.4 2008.01
The changed portions from
Ver. 1.3 are shown in blue.
4-2.

APERTURE DIAMETER CHECK/ADJUSTMENT

4-2-1. Aperture Diameter Check
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
Note:
Confirm the checking lens by complete. (The adjustment of focus brush and zoom brush is completed.)
1) Install the CF card to the camera.
2) Set the equipments, camera and master lens as shown in Fig.4-2-1.
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:
Zoom:
Focus:
Setting of Camera:
ISO:
Exposure Mode:
shutter Speed:
Aperture:
Focus Mode:
Metering:
Preset white balance: Tungsten
D-R:
SAL1870 (3.5-5.6/18-70) (DT 18-70mm F3.5-5.6)
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
Zoom: Wide end (focal length: 18mm)
Focus: Infinity end
Fig.4-2-1
EV12
Wide end (focal length: 18mm)
Infinity end
100
M
1/125
F5.6
MF
Center weighted
OFF
4-4