
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: (a)
Average “G” value of the three images shoot with checking lens: (b)
Calculate button
Check the “G” value
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