Deal today for $371

https://www.bhphotovideo.com/c/product/1383150-REG/yongnuo_yn14mmf2_8c_14mm_f_2_8_autofocus_lens.html

• Ultra wide-angle prime is designed for FX-format Nikon F-mount DSLRs, however can also be used with DX models where it provides a 21mm equivalent focal length.
• Bright f/2.8 maximum aperture suits working in difficult lighting conditions, benefits astrophotography applications, and also affords greater control over depth of field.
• One ultra-low dispersion aspherical element and one anomalous partial dispersion element noticeably reduce color fringing and chromatic aberrations in order to achieve high clarity and accurate color rendering.
• Two aspherical elements, including the UD aspherical element, and an ultra-high refractive index element help to minimize distortion and spherical aberrations for greater sharpness and accurate subject rendering. Individual glass elements are multi-coated to resist flare and ghosting for improved contrast and color fidelity.
• A DC motor is used for quick and accurate autofocus performance, and a dedicated switch lets you quickly change from AF to MF control. A focus distance scale is also featured to aid with pre-focusing techniques.
• Chrome-plated metal lens mount is durable and accurate for a secure fit with the camera body, and gold-plated contacts help to ensure consistent communication between the lens and camera.
• Seven-blade diaphragm contributes to a smooth bokeh quality.
• A micro-USB port is located on the barrel of the lens to allow for updating the lens's firmware.

Nikon preorder - https://www.bhphotovideo.com/c/product/1396247-REG/yongnuo_yn14mm_ultra_wide_angle_prime.html

Nikon mount version photo

UK price will be around £479.

Lens is official now

114° Ultra-wide Angle

The diagonal angle of view is about 114°. For YN14mm F2.8 helps to collect the vast landscape and giant structures, it’s easier to show a grand and solemn atmosphere.

Precision-machined Ultra-low Dispersion Lens and Aspherical Lens

YN 14mm F2.8 carries 2pcs of aspherical lens. One of the aspherical lens adopts ultra-low dispersion lens, which effectively compensates various optical aberration, reduce the color difference to the maximum, and provide excellent sharpness and color correction.

Precision-machined Abnormal Dispersion Lens

YN 14mm 2.8 adopts 1pcs of abnormal dispersion lens, which helps to better control the dispersion problem with super-wide angle and large aperture, and, helps to improve second order spectrum.

Glass Optical Lens, Multilayer Coating

The whole series of this product adopts glass optical lens and multilayer coating technology to effectively increase light transmittance and control backlight ghost image and glare.

Firmware Upgrade

YN14mm F2.8 is equipped with USD port. The users can download the latest firmware from the official YONGNUO website and update the lens to keep best compatibility and performance.

F2.8 Large Aperture

With F2.8 bright and large aperture, background blurred, subject highlighted.

Focus Modes: Auto Focus (AF) and Manual Focus (MF)

YN14mm F2.8 supports auto focus and manual focus. The focus mode can be selected according to practical requirement.

7 Diaphragm Leaves

YN14mm F2.8 has 7pcs of diaphragm leaves, which helps to take picture of circular defocused spots or helps to reduce the aperture and take picture of 14-star effect.

Durable Metal Mount

YN14mm F2.8 adopts chrome-plated and high-accuracy metal mount. It’s wearable, corrosion-resistant, and highly consistent with the camera.

Focus Distance Indicator

YN14mm F2.8 is equipped with focus distance indicator. It’s convenient for you to judge the distance and the depth of field.

Gold-plating Technology

The metal contacts adopts gold-plating technology to effectively improve signal conductivity and corrosion resistance.