Sony SAL16F28 Service Manual ▷ View online
4-4
SAL16F28 (2.8/16 FISH-EYE) (16mm F2.8 Fisheye)
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 front lens barrel was removed), or completion of
assembling.
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.4-2-1.
Fig.4-2-1
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 Luminance box:
Luminance:
EV12
Setting of Lens:
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
Luminance box
Luminance: EV12
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
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
Focus: Infinity end
Shoot the center of the luminance surface
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SAL16F28 (2.8/16 FISH-EYE) (16mm F2.8 Fisheye)
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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.4-2-2
2)
Read the image from the file menu.
Fig.4-2-3
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.4-2-4
Color space (Edit menu): sRGB
Fig.4-2-5
Area size for calculate (Edit menu
→Option): 256×256 Pixels
Fig.4-2-6
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SAL16F28 (2.8/16 FISH-EYE) (16mm F2.8 Fisheye)
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.4-2-7
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 checking lens (b) - Average “G” value of master lens (a)
Specification
Aperture error = –20 to +5
2)
When the aperture error is out of specification, perform “4-2-2. Aperture Diameter Adjustment”.
Calculate button
Check the “G” value
Ver. 1.4 2008.01
The changed portions from
Ver. 1.3 are shown in blue.
Ver. 1.3 are shown in blue.
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SAL16F28 (2.8/16 FISH-EYE) (16mm F2.8 Fisheye)
4-2-2. Aperture Diameter Adjustment
Equipment
• Luminance Box
• Camera DSLR-A100
• AE Master Lens
• Compact Flash (CF) Card (For image saving)
• Personal Computer (PC)
(Color Calculator 2 installed)
• Adhesive bond (B-10)
• Universal wrench
• Chip-A for Universal Wrench
• Chip-B for Universal Wrench
1. Adjustment Method
1)
Remove the rear ball group lens block from completely.
Note:
Use the universal wrench, remove the rear ball group lens block.
Fig.4-2-8
Rear Ball Group Lens Block
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