Sony SAL16F28 Service Manual ▷ View online
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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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SAL16F28 (2.8/16 FISH-EYE) (16mm F2.8 Fisheye)
2)
Move the preset lever to set the preset ring at the open aperture position.
Fig.4-2-9
3)
Loosen the three aperture unit holding ring stopper screws, turn the aperture unit holding ring in range of oblong hole of the inner
barrel to adjust the position that the aperture blade unit are hidden into the edge completely.
4)
Then tighten the three aperture unit holding ring stopper screws, apply the adhesive bond (B-10) to the head of three screws.
Fig.4-2-10
5)
Assemble the lens completely.
6)
Perform “4-2-1. Aperture Diameter Check”, and repeat “4-2-1. Aperture Diameter Check” and “4-2-2. Aperture Diameter Adjust-
ment” until the aperture error is within the specification.
Set the preset ring at the open aperture position.
Preset lever
Aperture Unit Holding Ring
Aperture Unit Holding Ring stopper screws
Apply the adhesive bond(B-10)(3 areas)
Apply the adhesive bond(B-10)(3 areas)
Aperture Blade unit are hidden into
the edge completely.
the edge completely.
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