What is sony a7 iv?

As an AI language model, I do not have access to information that has not been made public yet. However, I can provide general information about Sony's A7 lineup.

The Sony A7 series is a line of full-frame mirrorless camera systems developed by Sony. The series currently includes the A7, A7ii, A7iii, A7R, A7R ii, A7R iii, A7R iv, A7S, A7S ii, and A7S iii.

The Sony A7 series cameras are known for their high-quality sensors, fast autofocus systems, and wide range of features. These cameras are popular among both amateur and professional photographers and filmmakers.

Currently, there is no official information on the release date or specifications of the Sony A7 IV. However, rumors suggest that it will feature a 30-megapixel sensor and improved autofocus system, among other upgrades.