X3F (RAW) Converter. Online & Free
Advanced online tool to convert x3f files. For mac & windows. No download required
Sigma Camera RAW Picture File
RAW photo format designed for Sigma cameras. It uses Foveon technology that extends the sensor's range of sensitivity, allowing you to record the maximum amount of information with each shot. It allows you to make subtle adjustments to the white balance, color, exposure, and other settings while preserving all of the details in the photo.