So why is it that the iPhone 16 Pro models have a slower f/1.78 main camera lens compared to a faster f1.6 main camera in the iPhone 16 (regular and Plus, non-Pro) models. That seems to be a strange thing to do, making the Pro model with a slower lens aperture.
FYI for non-tech types: aperture speed is "faster" that is lets in more light the smaller the f/n.n number. Thus a 1.6 lens is larger faster and better in low light than 1.8 which is faster better in low light than 2.0, etc. (Assuming other factors are on par. But really, light gathering size is the primary thing and everything else is internal light and image processing of that primary light source.)
They have different sensors, the Pro / Pro Max Main wide sensors are considerable larger ones at 1/1.28'' (1,22 µm) at 24 mm, while the iPhone 16 / Plus have an 8 x 6 mm main wide sensor with 1,0 µm per pixel, about 20% smaller. However, that allows for the 1.6 lens an the - partially - compensation of the smaller sensor.