Description
This is a product description of the Sigma 85mm f/1.4 DG DN lens, a prime lens designed for full-frame Sony E-mount mirrorless cameras. Here are the key features mentioned:
1. **Portrait-length lens**: The lens is a portrait-length lens with a focal length of 85mm, equivalent to 127.5mm on APS-C cameras.
2. **Bright f/1.4 maximum aperture**: The lens has a bright maximum aperture of f/1.4, making it suitable for working in available light conditions and providing extensive control over depth of field.
3. **Advanced optical design**: The lens features an updated optical design with five Special Low Dispersion (SLD) elements and one aspherical element, which helps to reduce chromatic aberrations, color fringing, and spherical aberrations.
4. **Super Multi-Layer Coating**: The lens has a Super Multi-Layer Coating applied to the elements to minimize lens flare and ghosting, producing contrast-rich and color-neutral imagery.
5. **Stepping motor autofocus**: The lens features a stepping motor autofocus system that provides quick and quiet focusing performance, complemented by an optimized AF algorithm for smoother focusing.
6. **Manual aperture ring with de-click switch**: The lens has a manual aperture ring that can be de-clicked for smooth, silent aperture switching during video recording, and a dedicated aperture ring lock switch to prevent accidental shifting of the aperture setting.
7. **Autofocus-Lock (AFL) button**: The lens has a built-in AFL button that can be assigned additional functions, widening the range of operations available on the lens.
8. **Rounded eleven-blade diaphragm**: The lens features a rounded eleven-blade diaphragm that contributes to a smooth and pleasing bokeh quality.
9. **Weather-resistant construction**: The lens has a weather-resistant design with a brass bayonet that provides improved mounting accuracy and rigidity.
Overall, this lens is designed for creative and artistic applications, offering advanced optical performance and a sleek profile. Its bright f/1.4 maximum aperture and advanced autofocus system make it suitable for portrait photography, while its weather-resistant construction ensures durability in harsh environments.
