Sony SAL135F28 Service Manual page 58

Lens for dslr camera 135mm f2.8 [t4.5] stf

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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.4-2-8

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 = –20 to +5

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

If the specification is met, perform the "4-2-3. M Aperture Diameter Adjustment".

SAL135F28 (STF 2.8(T4.5)/135) (135mm F2.8 [T4.5] STF)

(a)

Check the "G" value

4-16

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