Difference between HAL 220 PL B9 and B11

This is an explanation of the differences between HAL 220 B9 and B11.
The basic optical performance is the same, but there is a difference in the aperture.

The difference in aperture value

HAL 220 B9 has an aperture range of T2.9-T16
HAL 220 B11 has an aperture range of T2.9-T22

Sunstar Shapes (9-element and 11-element apertures compared)

HAL 220 B9 has a 9-element aperture
HAL 220 B11 has an 11-element aperture.

The difference in the number of aperture feathers appears as the difference in the Sunstar shapes.

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