The 9F5.6 lens is a high-performance optical product designed for diverse imaging needs, boasting excellent optical properties and versatile compatibility. Below is a detailed overview of its key specifications and features:
Core Optical Specifications
- Focal Length: 9mm, with an equivalent focal length of 9mm, ensuring consistent and stable imaging performance.
- Image Format: Full-frame, enabling it to capture wide-range scenes without cropping, making it ideal for landscape, architectural, and panoramic photography.
- Image Diameter: Φ43.3mm, which matches the full-frame image format and ensures sufficient light reception for clear image quality.
- Field Angle: Features a broad field of view, with 132° diagonal (D), 123.5° horizontal (H), and 101.2° vertical (V) angles. This wide field of view allows users to capture more details in a single shot, perfect for scenarios requiring a comprehensive view.
- Working Wavelength: 400-700nm, covering the entire visible light spectrum. It accurately reproduces the colors of objects, ensuring true-to-life image rendering.
- Distortion: <1.4%, a very low distortion rate that minimizes image deformation. Whether shooting straight lines in architecture or regular-shaped objects, it maintains the integrity of the subject’s shape.
- Relative Illumination: >0.3, ensuring uniform light distribution across the entire image plane. There is no significant difference in brightness between the center and the edges of the image, avoiding dark corners.
Mechanical & Operational Features
- Mount Compatibility: Available in multiple mounts including M, NEX-E, M4/3, FX, Z, RF, and L. This wide compatibility allows the lens to be used with cameras from various brands, greatly expanding its application scope.
- Aperture: Has an aperture range of F/5.6~22, with 5 diaphragm blades. The adjustable aperture enables users to control the amount of light entering the lens and adjust the depth of field. The 5-blade design also helps in creating a natural and soft bokeh effect.
- Focusing: Manual focusing mode with a focusing range of 0.2m~∞. The close focusing distance of 0.2m allows for macro shooting, enabling users to capture fine details of small objects. Manual focusing also provides precise control over the focus point, suitable for professional photography scenarios.
- Zoom Function: Not applicable (/), as this is a fixed-focal-length lens. Fixed-focal-length lenses typically offer better optical performance and sharper image quality compared to zoom lenses.
- Optical Structure: Consists of 14+2 ASP (Aspherical) elements in 11 groups. The inclusion of aspherical elements effectively reduces spherical aberration, coma, and other optical aberrations, significantly improving image sharpness and contrast.
- Optical Total Length (TTL): 98.4mm, and the external dimension is Φ55*L78mm. Its compact and lightweight design makes it easy to carry, suitable for outdoor shooting and on-the-go photography.
- Optical Back Focal Length (B.F.L.): 20.9mm, which is an important parameter for ensuring proper installation and coordination with camera bodies.
Application Scenarios
With its wide field of view, low distortion, full-frame compatibility, and multi-mount support, the 9F5.6 lens is widely applicable in various fields. It can be used for landscape photography to capture magnificent natural scenery, architectural photography to show the grandeur and details of buildings, panoramic photography to create immersive wide-angle images, and even macro photography for shooting small objects. Additionally, its reliable performance in the visible light spectrum makes it suitable for general daily photography and professional imaging tasks.
