Metadata tab

Metadata tab
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This shows EXIF-like data from the "Properties" section of the X3F file, and also the structure of the X3F file itself.

Each X3F file has a lens-id (assuming a compatible lens was used) and this can be used to determine the model of the lens. I've currently built up a little database of 20 lenses, and if the lens used is among this list, a link is given to the page on Sigma's site.