The Samyang 14mm F/2.8 lens for Canon EF mount is an ultra-wide-angle prime lens designed for full-frame digital SLR cameras. This autofocus lens features a bright maximum aperture of F/2.8 and comprehensive weather sealing, making it suitable for professional use in various environmental conditions. With a field of view of 116.6 degrees, it provides extensive coverage for landscape, architectural, and interior photography. The optical construction includes fifteen lenses in ten groups, including one extra-low dispersion element, two aspherical elements, and four high-refractive-index lenses. These components work together with UMC anti-reflective coatings to deliver high image quality with excellent clarity, contrast, and color fidelity across the entire image field. The lens maintains consistent performance from the center to the edges, as demonstrated by its modulation transfer function characteristics. A rounded seven-blade diaphragm contributes to appealing bokeh quality and attractive star effects with point light sources. The lens features a durable full-metal housing with an integrated lens hood to protect against stray light and physical damage. Weighing approximately 485 grams and measuring about 94 mm in length with a filter thread diameter of 95 mm, it offers a compact and lightweight design compared to similar ultra-wide-angle lenses. The focusing system utilizes a minimized lens group movement design for precise, fast, and quiet autofocus operation. A manual/autofocus switch provides flexibility for various shooting situations. When used with APS-C format Canon EF mount cameras, the lens offers an effective focal length of approximately 22.4 mm. The build quality and optical performance meet the demands of professional photographers seeking reliable ultra-wide-angle capabilities.