This is a product description of a lens, likely a prime lens, with the following key features: 1. **APS-C format**: The lens is designed for APS-C sensor cameras, not full-frame sensors. 2. **84mm (Full-Frame Equivalent)**: The lens has a focal length of 84mm, which is equivalent to a 128mm lens on a full-frame camera. 3. **f/1.4 to f/16 aperture range**: The lens has a wide aperture range of f/1.4 to f/16, allowing for control over depth of field and exposure. 4. **Rounded 9-Blade Diaphragm**: The lens has a rounded 9-blade diaphragm, which helps to create a smooth and pleasing bokeh (out-of-focus area). 5. **Stepping Motor AF System**: The lens features a stepping motor autofocus system, which provides fast and quiet autofocus performance. 6. **Super Multilayer Coating**: The lens has a Super Multilayer Coating, which helps to reduce flare and ghosting, and improves overall image quality. 7. **One SLD Element, Two Aspherical Elements**: The lens contains one SLD (Special Low Dispersion) element and two aspherical elements, which help to correct for various types of aberration and improve image sharpness. 8. **Weather-Sealed Construction**: The lens has a weather-sealed construction, making it suitable for use in harsh environments or during outdoor shooting in adverse weather conditions.
