https://wccftech.com/ios-15-1-will-bring-prores-video-and-macro-mode-toggle-on-iphone-13-pro/

Apple has seen fit to release iOS 15.1 beta 3 to developers for testing purposes. The upcoming update will feature support for major features announced at the iPhone 13 launch. We previously came to know that the ProRes video will be available for all iPhone 13 Pro users in a future update. The upcoming update will include the new video format along with other camera features.

As mentioned earlier, iOS 15.1 will bring new camera-related features to the table like ProRes video and a toggle for Macro mode. The new video format can be enabled from the Settings app under the "Camera" section. Just tap on "Formats" and then toggle on "Apple ProRes." Take note that ProRes will be limited to 1080p at 30 fps on iPhone 13 Pro models with 128GB of storage. On iPhone 13 Pro models with more than 256GB and higher storage, the ProRes video will be available in 4K. This is due to the fact that 1-minute of 10-bit HDR ProRes video will take as much as 1.7GB of space in HD mode.