Invented nominal f-number example at the same 20 mm focal length: N=f/D, where D is effective aperture (entrance-pupil) diameter. N=2 gives D=10 mm; N=4 gives D=5 mm. The drawn circular pupil diameters share the same scale, so the smaller pupil has one quarter of the area. The dots traverse the two fixed diameters once as a dimensional guide, not moving hardware. This is pupil geometry, not a brightness measurement or an exact mechanical-iris drawing. Close-up working f-number and actual transmission need separate evaluation.
Original PPVision teaching animation and Microsoft Zira synthetic English voice. No third-party video, images, music or narration.
Primary references, checked 30 October 2026:
PPVision Industrial Cameras / Xiamen Dongruo Technology Co., Ltd. / Trading Company, Xiamen, China. Business inquiries: wangwei@ppvision.top
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