iPhone 13 PRO: Is the f/2.8 on the telephoto really a problem?

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matejphoto New Member • Posts: 18
iPhone 13 PRO: Is the f/2.8 on the telephoto really a problem?

I saw many people pointing out that the telephoto lens on the iPhone 13 Pro has a disappointing f/2.8 lens. They also like to point out that the iPhone 12 has f/2.0 (Pro) and f/2.2 (Pro Max).

Few things that I think are important to point out:
1.) The aperture value is almost useless unless you know the size of the sensor. As far as I know, nobody outside apple knows the sensor size behind the telephoto on the iPhone 13 Pro.
Extreme example for illustration: Imagine it is a 77mm lens with a full frame sensor and f/2.8. That would give you amazing image quality and lots of bokeh. So until we know the sensor size the f/2.8 is meaningless.

2.) Since apple did not point any increase in sensor size, let's assume that the sensor size is the same as in iPhone 12 PRO.
But since the equivalent focal length changed, I think the better indicator of overall image quality is the size of the entrance pupil (bigger = more light).
Entrance pupil iPhone 12 PRO: 26.0
Entrance pupil iPhone 12 PRO MAX: 29.5
Entrance pupil iPhone 13 PRO: 27.5
So the iPhone 13 PRO is not a big improvement but on par with previous models.
Again an extreme example: Canon 600mm is only f/4, but has a massive entrance pupil and amazing image quality.

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