Lens Not Attached : MANUAL LENS need you to enable "M mode " or "Release without lens" in the setting of camera Lens construction is 12 elements in 7 groups, multi-layer coatings, Maximum aperture of 1.2 delivers smooth bokeh Minimum focusing distance of 0.6m, Full-frame Visual angle:diagonal 46.9° horizontal 39.3° vertical 26.4°; APS-C Visual angle:diagonal 33.1° horizontal 25.8° vertical 17.4° The focus ring is very well damped, good amount of travel, easy to find focus Built very well and feels solid, aperture blades quite impressive Specification: Aperture Range: F1.2-F22 Focal Length: 50mm Format: Full Frame Focus Rotation: 90° Min Focus Dist: 60cm Filter Thread: ø67 Iris Blades: 10 Lens Structure: 12 Elements in 7 Groups FOV on FF Cameras: Diagonal 46.9° Horizontal 39.3° Vertical 26.4° FOV on APS-C Cameras: Diagonal 33.1° Horizontal 25.8° Vertical 17.4° Lens Weight: 620g