Sony SAL1118 Service Manual ▷ View online
4-5
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
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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
4-6
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
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 = -- 50 to
±10
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.
4-7
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
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)
1. Preparations
1)
Remove the rear light interception tube.
2)
Set the zoom ring at the Tele end position.
3)
Move the preset lever to set the preset ring at the open aperture position.
Fig.4-2-8
2. Adjusting Method
1)
Let the operation lever of the preset ring move to left and right sides by loosening two screws slightly to move to left and right sides.
2)
Move the two screws while seeing the lights from the rear lens element side, and tighten two screws at the point where the diaphragm
blades are hidden into the edge completely.
Fig.4-2-9
3)
Perform “4-2-1. Aperture Diameter Check”, and repeat steps 1) to 3) until the aperture error is within the specification.
4)
After the adjustment is completed, apply the adhesive bond (B-10) to the two screws tightened in step 2).
Preset lever
Preset ring
Scres (Apply adhesive bond (B-10) after tightening)
Operation lever of Prisettoring
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SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
4-3.
PROJECTIVE RESOLVING POWER CHECK
Equipment
• Lens Test Projector and Variable Transformer (Output voltage: AC 100 V)
Note:
Connect the variable transformer (Output voltage: AC 100 V) to the lens test projector.
• A-mount Attachment
• Screen (Art paper)
• Tape Measure
• Plane Mirror (For SLRs)
1. Preparations
Note:
Note:
Check the projective resolving power of the checking lens at the following focal-length and distance.
Focal-length f (mm)
distance (m)
11
0.66
12
0.72
14
0.84
16
0/96
18
1.08
Table 4-3-1
1)
Perform the following steps (1) to (3), and incorporate the internal lenses of the lens test projector according to the checking focal-
length.
(1) Open the lid of the lens test projector.
(2) Pull up and turn the fixed levers on the right and left sides of the lens test projector.
(3) Remove or insert the lens.
Note:
Be sure to have the right position and direction of the lens.
Fig.4-3-1
Lens test projector
Incorporate of the lenses
according to the checking focal-length (f).
according to the checking focal-length (f).
Lens
Fixed lever
Fixed lever
Lid
f=18 to 35 mm
f=35 to 100 mm
f=100 to 200 mm
f=200 to 300 mm
Heat-absorbing filter
Chart
Chart
Chart
Chart
Filament
Filament
Filament
Filament
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