Sony SAL300F28G Service Manual ▷ View online
5-13
SAL300F28G (2.8/300 G) (300mm F2.8 G)
3.
Set the following contents in the SETUP window.
• MODEL
Model to be adjustment this time
• Language
English
• State
FINAL/HALF
• Process
SERVICE
4.
Confirm that all of the items are set, and click [OK].
Fig.5-1-30
5-1-5. About Inspection Procedure of Lens Adjustment Program (ActuatorChecker)
The inspection method has the method of executing the method of inspecting the corresponding model as everything continues and the
inspection of each item one by one.
Click
[START]
from the start up window when you inspect the corresponding model as everything continues.
5-14
SAL300F28G (2.8/300 G) (300mm F2.8 G)
5-2.
APERTURE DIAMETER CHECK/ADJUSTMENT
5-2-1. Aperture Diameter Check
Equipment
• Pattern box PTB-1450
• 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.5-2-1.
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 master lens and checking lens.
Setting of Lens:
Zoom:
Wide end (focal length: 70mm)
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: 3200K
D-R:
OFF
Small pattern box
PTB-1450
PTB-1450
Camera
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: 3200K
D-R: OFF
ISO: 100
Exposure Mode: M
Shutter Speed: 1/125
Aperture: F5.6
Focus Mode: MF
Metering: Center weighted
Preset white balance: 3200K
D-R: OFF
Master lens or checking lens
Focus: Infinity end
Focus: Infinity end
5-15
SAL300F28G (2.8/300 G) (300mm F2.8 G)
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2. Checking of Image
Note:
Check the image of both 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
5-16
SAL300F28G (2.8/300 G) (300mm F2.8 G)
4)
Click the calculate button to measure the image.
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)
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.
Aperture error = Average “G” value of master lens (a) - Average “G” value of checking lens (b)
Specification
Aperture error = –25 to –5
2)
When the aperture error is out of specification, perform “5-2-2. Aperture Diameter Adjustment”.
Calculate button
Check the “G” value
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