Sony SAL1118 Service Manual ▷ View online
4-10
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
2. Checking Method
1)
Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center (y’=0).
2)
Read the number of the smallest pitched lines at the center (y’= 0).
Fig.4-3-3
3)
Turn the mount rotation ring of lens test projector until the projected image at a certain peripheral point (y’= 9) on the screen appears
the most unsharp.
Read the number of the smallest pitched lines (both saggital and meridional: 3 lines) at the peripheral point.
When the partial blur appears, loosen the three fixing screws of the 5th lens barrel assembly shown in the Fig.4-4-5 and adjust the
position to from side to side and up and down.
Note:
When reading the number of the smallest pitched lines, be careful of the spurious resolution.
Spurious resolution is the reversed image of 2 or 4 lines which appears on screen when focus is beyond maximum revolving power.
Do not confuse spurious resolution for the smallest pitched lines.
Fig.4-3-4
4)
Change the focal-length (zoom) and distance of the checking lens, and check that the all readings (y’= 0, saggital (S) and meridional
(M) at y’= 9) at each focal-length (zoom) and distance is within the specification of the Table 4-3-2.
Specification
Focal-length f (mm)
distance (m)
Number of the smallest pitched lines
Center (y’= 0)
Peripheral (y’= 9)
(Lines per mm)
(Lines per mm)
S
M
11
0.66
100 or greater
40 or greater
40 or greater
12
0.72
100 or greater
40 or greater
40 or greater
14
0.84
100 or greater
40 or greater
40 or greater
16
0/96
100 or greater
40 or greater
40 or greater
18
1.08
100 or greater
40 or greater
40 or greater
Table 4-3-2
The number represents for lines per mm.
Saggital (S)
Meridional (M)
Correct resolution
Spurious resolution
4-11
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
5)
G11 gap adjusting washer (Reference value t=0.1 mm)
In the resolution adjustment, if an image is warped, the adjustment within the range of G11 washer is allowed.
• When the peripheral image is front-focused with respect to the center, extract the washer.
• When the peripheral image is rear-focused with respect to the center, add the washer.
G11 adjustment washer
Parts No.
T (mm)
A
2-886-862-01
0.2
B
2-886-863-01
0.1
C
2-886-864-01
0.05
D
2-886-865-01
0.03
E
2-886-866-01
0.02
Table 4-3-3
Fig.4-3-5
6)
After the checking is completed, turn the lamp switch of the lens test projector to OFF and cool the inside of the lens test projector,
then turn the fan switch to OFF.
5 th Lens Set
G11 Gap Adjustment Washer
4-12
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
4-4.
FOCUS-SHIFT/FLANGE BACK (f’F) AND OPTICAL AXIS CHECK/ADJUSTMENT
4-4-1. Focus-Shift/Flange Back (f’F) Check and Optical Axis Adjustment
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
1. Preparations
1)
Set the equipments as shown in the Fig.4-4-1.
Fig.4-4-1
2)
Looking through the eyepiece lens, turn the eyepiece ring of the flange back tester so that cross line or scale in the view is the sharpest.
3)
Attach the flange back gauge (43.50mm) securely to the A-mount attachment and hold them together.
4)
Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge (43.50mm) is the sharpest.
Note:
Turn the knob in the direction of the arrow of Fig.4-4-2 for correct reading.
Fig.4-4-2
5)
Turn the scale ring of the dial gauge until the long pointer indicates “0”.
Note:
This position is the flange back (f’F) = 43.5 mm.
Memorize the position of short-pointer.
flange back gauge (43.50mm)
A-mount attachment
Objective lens (10x)
Dial Gauge (Min. scale: 0.01 mm)
Scale ring
Eyepiece lens (7x)
Eyepiece ring
Focusing knob
Focus on fine lines on the surface.
Always turn the knob in the arrow
direction for correct reading.
direction for correct reading.
4-13
SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)
2. Focus-shift/Frange Back (f’F) Check and Optical Axis Adjustment
1)
Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
Fig.4-4-3
2)
Set the focus ring of the checking lens to infinity end position while looking through the microscope, and align the optical axis to the
center of the chart image accurately.
3)
Turn the focusing knob of the tester until the chart image is the sharpest (red and green color areas are equal on the chart *).
*: Position in which the color of collimator chart changes from green into red and come into focus.
Also check the optical axis aligns with the chart center. (Refer to Fig.4-4-4.)
Note:
Figure shows example. The cause depends on individual lens.
Fig.4-4-4
4)
If the optical axis aligns the most unsharp, loosen the three screws shown in the Fig.4-4-5 and shift the 5th lens barrel assembly to let
the vertical and horizontal.
Fig.4-4-5
Optical Alignment
Best alignment
Best alignment
Incorrect aligned
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
1000 mmcollimater
Checking lens
Screws
At the time of optical axis
(centering) adjustment
At the time of optical axis
(centering) adjustment
5th lens barre-B assembly
5th lens barre assembly
Screws
At the time of resolving
(partial blur) adjustment
At the time of resolving
(partial blur) adjustment
5th lens barrel
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