The X3F file type is primarily associated with Sigma Camera by Sigma. Use the SIGMA Photo Pro software provided with the camera to download and manipulate the photos. The Foveon X3 direct image sensor captures all three colors at every pixel location and requires special software to manipulate the RAW files. Any camera with a Foveon sensor may be able to save and use this format.
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You can use it on electronic devices such as computers, tablets, and mobile phones.