Feature: 1. Wide‑angle is also supported by a large aperture. And the large aperture of F1.5 and a wide‑angle focal length of 21mm / 0.8in can be used in humanities to show the background while gaining a three‑dimensional sense of space. 2. Lens adopts 13 elements and 11 groups of optical structure design and is compressed in a space of 70mm / 2.8in in length. The design adopts a fully open aperture, which reduces the contrast and closes one gear to obtain the best center sharpness idea. 3. The front of the lens is equipped with a detachable hollow hood, and a corner of the metal hood is hollowed out to prevent the eyepiece viewing angle from being blocked. 4. Metal lens barrel is made of aviation‑grade aluminum anodic oxidation process, and the surface is finely sandblasted to highlight the texture. 5. Focus ring is equipped with a metal focus handle, which brings you a more distinguished operating experience. 6. It is equipped with a round filter holder to support the installation of 72mm / 8.3in diameter filters. Specification: .Item Type: Full Fame Camera Lens Material: Aviation Aluminum + Optical Glass Focal Length: Approx. 21mm / 0.8in Weight: Approx. 668g / 23.6oz Optical Structure: 13 Elements in 11 Groups Aperture Blade: 10 Pcs Maximum Aperture: F1.5 Minimum Aperture: F16 Frame: Full Frame Filter Size: Approx. 72mm / 2.8in (Requires Circular Filter Holder) Closest Focusing Distance: Approx. 0.5m / 1.6ft Focus Method: Manual Bayonet: E Bayonet Applicable Models: For Sony A9, A7 series, FS5, FS7, FS7M2, FS5M2K, A3000, A5000, A5100, A5100L, A6000, A6000L, A6300, A6400, A6500, A6600, NEX-3, NEX-3N, NEX-3R, NEX-C3, NEXF-F3K, NEⅩ-5, NEX-5K, NEX-5A, NEX-5C, NEX-5N, NEX-5T, NEX-5R, NEX-6, NEX-7 Package List: 1 x Lens1 x Filter Adapter1 x Manual