Sony SAL1118 Service Manual page 37

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4) Click the calculate button to measure the image.

5) After measuring, check the "G" values.

Average "G" value of the three images shoot with master lens:

Average "G" value of the three images shoot with checking lens: (b)

Calculate button

Fig.4-2-7

3. Checking Method

1) Calculate aperture error using the following formula, and check that the aperture error is within the specification.

Aperture error = Average "G" value of master lens (a) - Average "G" value of checking lens (b)

Specification

Aperture error = -- 50 to ±10

2) When the aperture error is out of specification, perform "4-2-2. Aperture Diameter Adjustment".

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

(a)

Check the "G" value

4-6

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