Amazon.com : Meike 8mm f3.5 Ultra Wide Angle Fisheye Lens for All EOS EF Mount DSLR Cameras EOS 70D 77D 80D Rebel T7i T6i T6s T6 T5i T5 T4i T3i SL2,etc :
Amazon.com : Altura Photo 8mm f/3.0 Professional for Canon Wide Angle Lens Aspherical Fisheye Lens for Canon EOS 90D 80D 77D Rebel T8i T7 T7i T6i T6s T6 T100 SL2 SL3 DSLR
Amazon.com : Rokinon RKHD8MV-C HD 8mm t/3.8 Fisheye Fixed Lens for Canon with De-clicked Aperture and Removable HoodWide-Angle Lens : Camera Lenses : Electronics
Amazon.com : Sigma 8mm f/3.5 EX DG Circular Fisheye Lens for Canon SLR Cameras : Camera Lenses : Electronics