Nine overlapping spring-steel blades form a variable optical aperture. Inspect the layered cam mechanism and explore the inverse-square law that controls exposure.
Aperture diaphragm
f / 5.6HALF-LIGHT
f/2.8f/4f/5.6f/8f/11f/16f/22
Ideal optical physics
Relative transmitted light25.0%
Exposure stops lost2.00 EV
Blades / engineering9 / rotary linkage
Geometry79,740 triangles
Mouse drag / touch to orbit · Scroll / pinch to zoom. The illumination model assumes a lossless optical system: light throughput ∝ 1 / f². The blade geometry is a simplified educational reconstruction, not a calibrated lens mechanism.