Sony SAL35F14G Service Manual page 54

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)
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 = 0 ±12
2) When the aperture error is out of specification, perform "4-2-2. Aperture Diameter Adjustment".
SAL35F14G (1.4/35G) (35mm F1.4G)
Calculate button
Fig.4-2-7
(a)
Check the "G" value
4-15