Lens structure 8 groups 11 elements; Minimum focusing distance of only 35cm This manual focus rectangle fisheye lens offers an impressive 200° field of view Lens Not Attached : MANUAL LENS need you to enable "M mode " or "Release without lens" in the setting of camera COMPATIBLE WITH: All EF-Mount APS-C cameras; including the Rebel T7i, T6s, T6i, T6, T5i, T4i, T3i, SL1, SL2; EOS 60D, 77D, 70D, 80D; EOS 7D, 7D MK II. Also compatible with FULL FRAME cameras but please keep in mind it will produce a more circular "360" image with black vignette borders. Note: Also compatible with FULL FRAME cameras but please keep in mind it will produce a circular, vignette image.