Sony SAL35F14G Service Manual page 56

3) Turn the mount rotation ring of lens test projector until the projected image at a certain peripheral point (y'= 15) 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 as shown in Fig. 4-4-4.
Do not confuse spurious resolution for the smallest pitched lines.
Correct resolution
4) Check that the all readings (y'= 0, saggital (S) and meridional (M) at y'= 15) is within the specification of the Table 4-4-2.
If the specifications are not satisfied, perform the "4-4-2. Projective Resolving Power Adjustment".
Specification
Projection-
distance (m)
1.4
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.
4-4-2. Projective Resolving Power Adjustment
1) If the specifications in the section "4-4-1 Projective Resolving Power Check" are not satisfied, replace the following parts and
perform the "2. Checking Method" again.
Part No.
A-1191-453-A BLOCK, 3 GROUP LENS
2-684-875-01 LENS (G2)
2-684-877-01 LENS (G3)
SAL35F14G (1.4/35G) (35mm F1.4G)
Spurious resolution
Fig. 4-4-4
Number of the smallest pitched lines
Center (y'= 0)
(Lines per mm)
125 or greater 50 or greater
Table 4-4-2
Description
Peripheral (y'= 15)
(Lines per mm)
S M
40 or greater
4-17