Read Sony SAL135F18Z Service Manual online
4-22
SAL135F18Z (Sonnar 1.8/135 ZA) (Sonnar T
*
135mm F1.8 ZA)
3)
Turn the mount rotation ring of lens test projector until the projected image at a certain peripheral point (y’= 15, y’= 18) 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.
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)
Check that the all readings (y’= 0, saggital (S) and meridional (M) at y’= 15, 18) is within the specification of the Table 4-3-3.
When the checking lens is out of specification of the Table 4-3 3, perform the following adjustment.
Remove the three screws from the front of the lens block 4.
Remove the lens block 2 from the removing frame 2, insert the tilt adjustment washer to front pin side of the lens block 2.
Tilt Adjustment Washer
Part No.
Description
Thickness (mm)
2-897-850-01
Tilt adjustment washer A
0.02
2-897-851-01
Tilt adjustment washer B
0.03
2-897-852-01
Tilt adjustment washer D
0.1
Table 4-3-2
Specification
Focal-length
Distance (m)
Number of the smallest pitched lines
f (mm)
Center (y’ = 0)
Peripheral (y’ = 15) (Lines per mm)
Peripheral (y’ = 18) (Lines per mm)
(Lines per mm)
S
M
S
M
135
5.4
125 or greater
100 or greater
100 or greater
100 or greater
100 or greater
Table 4-3-3
5)
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.
Correct resolution
Spurious resolution
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