Sony SAL28F28 Service Manual page 36

2. Checking Method
1) Attach the checking lens to the flange back tester, and set the 1000 mm collimator.
1000 mm collimator
2) Set the distance tube 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.
Optical Alignment
Best alignment
4) Calculate the flange back (f'F) of the checking lens using the following formula, and check that the specification of the Table 4-4-1 is
satisfied.
Flange back (f'F) of the checking lens = (Flange back gauge) + (Number of short-pointer revolution) + (Reading of long-pointer)
Specification
Focal-length
f (mm)
28
Table 4-4-1
5) When the flange back (f'F) of the checking lens is out of specification of the Table 4-4-1, perform "4-4-2. Flange Back (f'F)
Adjustment".
SAL28F28 (2.8/28) (28mm F2.8)
Checking lens
Fig.4-4-3
Incorrect aligned
e.g. As the focusing knob is turned, the chart may appear blurry as illustrated.
The cause depends on individual lens.
Fig.4-4-4
f'F (mm)
(Infinity position)
44.55 to 44.58
4-13