I want to shoot a dance video with a green screen as the background and key in later, what size is the most suitable to buy?

The size of the green screen you choose should be based on the size of the video you are shooting and the shooting distance. Generally speaking, the size of the green screen should be at least as big as the frame size of the video to avoid green edges or jagged effects when keying in later.

If you plan to shoot full HD video (1080p), it is recommended that you purchase a green screen that is at least 1.8 meters high and 1.2 meters wide. For higher resolution videos (such as 4K or 8K), a larger green screen cloth will be needed to ensure better post keying.

Additionally, when buying a green screen fabric, pay attention to the following:

1. Choose a high-quality green screen fabric to minimize flickering and reflections.

2. Make sure the color of the green screen cloth is uniform to avoid color deviation in post keying.

3. Ask the merchant if there is a matching set when purchasing I would also like to ask, what do I need to pay attention to when shooting for better post keying?