Sony AF DT 50 mm f/ 1.8 SAM Lens マニュアル

4-13

SAL50M28 (MACRO 2.8/50) (50mm F2.8 Macro)

1)

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

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 flange back tester, and set the dial gauge value to “44.60 mm”.

4)

Turn the focus ring of the checking lens from near to infinity side 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.)

Figure shows example. The cause depends on individual lens.

5)

Check that the infinity index of the focus scale plate is within the distance index width of the distance scale window as shown in the

Fig. 4-4-5.

If not, perform “4-4-2. Flange Back (f’F) Adjustment”.

Optical 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.

1000 mm collimator

Checking lens

Off center

Within 0.05 mm

Astigmatism

Within 0.04 mm

Distance index width of the
focus scale window