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A comment on Why are modern 50mm lenses so damned complicated?. Parent comment

Re:Why are modern 50mm lenses so damned complicated? by Zak on Thursday May 13, 2021 @07:40PM (#27148891)
The intensity of the light is reduced because the aperture is the same diameter (50/3.4 = 25/1.7), but the light has to cover four times the area. To get the same exposure with double the f number and the same shutter speed will require four times the ISO.

> what determines in the same scene how much light is received by the sensor depends on the size of the aperture in milimiters

That's true, but the amount of light is not the intensity of light.

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Re:Why are modern 50mm lenses so damned complicated? by sudosysgen on Friday May 14, 2021 @11:59AM (#27155669)
It's the amount of light that decides the amount of noise.

Yes, you will need four times the ISO. But you will get exactly the same amount of noise.

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