How to do Alt Masking on Godox AD600 Pro, AD200, and QT600II

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Alt masking is a tool to "alternate" between light Godox light sources to generate images that can later be used as "masks" It's most useful for e-commerce product photography to generate masks that allow you to easily create images with a pure-white background. But it can also be used for creating composites as well. Alt masking is available on Godox flash strobes such as the QT400II, QT600II, QT1200II, AD600, AD600 Pro, and AD200. When using this feature flashes must be in manual.