Canon Mount. This is my absolute favorite lens. Only selling it because I have converted to full frame. This lens has had a lens filter on it since new, and not a scratch on it. UV filter comes with lens purchase. "A sophisticated and compact prime, the Sigma 30mm f/1.4 DC HSM Art is a versatile normal-length lens for APS-C-format Canon EF-mount cameras. Featuring a bright f/1.4 maximum aperture, this lens excels in difficult lighting conditions and also affords increased control over depth of field for isolating subjects using selective focus." These are currently selling new on B&H Photo for right now for $633..48 CDN plus tax. The techpro slim UV filter is valued at $34.99. Save yourself over $300 by getting this package!