Distinguished by its pancake design and slightly-wider-than-normal focal length, the YN 40mm f/2.8N from Yongnuo is a compact prime for Nikon F-mount DSLRs. The comfortable field of view of the lens pairs well with the sleek profile to make it an ideal everyday lens to suit photographing in a variety of situations. Its optical design incorporates one aspherical element to reduce spherical aberrations and distortions for greater sharpness, and individual glass elements are also multi-coated to suppress flare for improved contrast. A DC motor affords quick and accurate autofocus performance and a switch lets you quickly change from AF and MF focusing methods. Additionally, a micro-USB port is located on the front of the lens to permit installing firmware updates for the lens.
- Slightly wider than the standard 50mm, this 40mm f/2.8 lens is designed for FX-format Nikon F-mount DSLRs, however can also be used with DX models where it provides a 60mm equivalent focal length.
- Pancake form factor is slim and lightweight to make for an especially portable lens to suit everyday shooting.
- Relatively bright f/2.8 maximum aperture affords control over depth of field and also helps to realize the compact overall size.
- One aspherical element is located at the rear of the lens construction, and helps to minimize spherical aberrations and distortion for greater sharpness and clarity.
- 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.
- Six-blade diaphragm contributes to a smooth bokeh quality.
- A micro-USB port is located on the front of the lens to allow for updating the lens’s firmware.