https://wccftech.com/iphone-13-pro-max-improved-wide-angle-camera/

Just like how the iPhone 12 Pro Max was the only member of the entire iPhone 12 series to support Sensor-Shift Optical Image Stabilization, the iPhone 13 Pro Max is also said to receive an exclusive upgrade in the optics category. Unfortunately, just like 2020, customers will have to spend a lot more money to get their hands on the ‘top of the line’ model.

A report from Ming-Chi Kuo states that the iPhone 13 Pro Max will be the only handset from the iPhone 13 series to feature a wider aperture from the main camera. Where the iPhone 13 mini, iPhone 13, and iPhone 13 Pro will reportedly sport the same 7P wide-angle lens with an F/1.6 aperture like the three models from the iPhone 12 family, this is where the iPhone 13 Pro Max will set itself apart.