Dual camera-equipped iPhone 8 to feature dual OIS, redesigned telephoto lens
To support OIS with the telephoto lens, Apple may have to increase the image circle of the lens, which will lead to longer calibration time and a more complex assembly processes. Due to the increase, the telephoto lens itself must be redesigned, as the increased image circle will result in degraded photo quality around the corners. This information comes from Ming-Chi Kuo's sources.
Previously, Kuo has reported that Apple might have three iPhone 8 models in the works – a 5.1-inch or 5.2-inch OLED screen model, a 5.5-inch variant with LCD display, and a 4.7-inch version with LCD display. The 4.7-inch variant probably won't include a dual camera setup.