Sony SAL24105 Service Manual ▷ View online
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SAL24105 (3.5-4.5/24-105) (24-105mm F3.5-4.5)
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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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SAL24105 (3.5-4.5/24-105) (24-105mm F3.5-4.5)
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 = –15 to +10 (Wide end: 24mm)
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 2007.12
The changed portions from
Ver. 1.3 are shown in blue.
Ver. 1.3 are shown in blue.
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SAL24105 (3.5-4.5/24-105) (24-105mm F3.5-4.5)
4-2-2. Aperture Diameter Adjustment
Since the iris blades remain a little in the optical path when the lens is set to the open F value, the aperture diameter changes when zoom-
operated. Therefore, adjust in the procedure below.
Equipment
• Adhesive bond (B-10)
• Iris Open Fixture
• Caliper
1. Preparation
1)
Remove the 2 group lens block from the focus cam tube block and assemble parts shown in Fig. 4-2-8 in it.
2)
Set the zoom to 105 mm.
3)
Attach the maximum aperture jig, and open iris .
Fig.4-2-8
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Fixed Holding Tube Block
Zoom Ring
Lens Mount Block
Rear Light Shield Barrel
Focus Cam Tube Block
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SAL24105 (3.5-4.5/24-105) (24-105mm F3.5-4.5)
2. Adjustment Procedure
1)
Adjust the diameter of inscribed circle of iris blades to about 16.6 mm by rotating the aperture blade holding ring. (Fig. 4-2-9.)
2)
Operate the preset ring and check the shape of inscribed circle of iris blades again.
3)
Check the tolerance of iris again and repeat the adjustment/check until the tolerance of iris meets the specification.
4)
After completing the adjustment, apply the adhesive bond (B-10) to three indicated portions.
Fig.4-2-9
16.5mm
Apply the adhesive bond (B-10)
Aperture Blade Holding Ring
Preset Lever
Preset Ring
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