Bundle Items Include: Zeiss Milvus 21mm f/2.8 ZE Lens for Canon EF (2096-549) + 128GB Extreme Pro SD Card + 82mm 3-Piece Filter Kit + Padded Lens Case + Memory Card Wallet + Hand Strap + Lens Cap Keeper + Mini Tripod & Cleaning Kit. Wide-angle prime is designed for full-frame Canon EF-mount cameras, however can also be used with APS-C models where it provides a 33.6mm equivalent focal length.. Bright f/2.8 maximum aperture suits working in available-light conditions and is also well-suited for astrophotography use.. Distagon optical concept affords high sharpness, well-corrected image quality from edge-to-edge, and very low field curvature.. Five anomalous partial dispersion elements are used to significantly reduce color fringing and chromatic aberrations for increased clarity and color fidelity.