Solid App & Good Interface - Does Exactly What It Says
Can add & edit (highlights changes in bright blue): Image Create Date & Time; Title, Caption, Keywords, Description, Photographer; GPS Location, camera, model, software, lens; exposure data (even those w/o Exif data); AND you can save these as Presets, Batch write or Clone Exif data to a bunch of files, Clear off all exif data, Rename using tags. Nice app that does it all, even if it costs $10.
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Image Exif Editor