Sony SAL1118 Service Manual page 44

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2. Focus-shift/Frange Back (f'F) Check and Optical Axis Adjustment

Attach the checking lens to the flange back tester, and set the 1000 mm collimator.

1000 mmcollimater

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.

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

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.

SAL1118 (4.5-5.6/11-18) (DT 11-18mm F4.5-5.6)

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.

Screws

At the time of optical axis

(centering) adjustment

5th lens barrel

5th lens barre-B assembly

Fig.4-4-4

Fig.4-4-5

4-13

5th lens barre assembly

Screws

At the time of resolving

(partial blur) adjustment

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