[USED] SIGMA 20 f/1.8 (α- Mount)
3,500 ฿
Out of stock
Specification
Key Specifications (Sony A-Mount)
- Aperture Range: f/1.8 to f/22.
- Optical Design: 13 elements in 11 groups, including 2 aspherical elements to minimize distortion.
- Diaphragm: 9 blades.
- Minimum Focus Distance: 20cm (7.9 inches), offering a 1:4 macro magnification ratio.
- Dimensions & Weight: Measures approximately 88.6mm x 89.5mm and weighs 520g (18.3 oz).
- Filter Thread: Large 82mm front thread.
Core Features
- Dual-Focus (DF) System: Features a “clutch” mechanism where you push or pull the focus ring to switch between Auto Focus (AF) and Manual Focus (MF).
- Rear Focus System: The front element does not rotate during focusing, making it easier to use circular polarizers or petal-shaped hoods.
- Full-Frame Coverage: While designed for full-frame (DG) sensors, it provides a 30mm equivalent focal length when used on APS-C Sony cameras.
- Sony A-Mount Specifics: Unlike the Nikon version, the Sony A-mount version does not have a physical aperture ring because aperture is controlled electronically by the camera body.
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