Here is a description of the Sony FE 20mm F1.8 G lens in pointers:
Lens Type: Ultra-wide-angle prime lens designed for full-frame Sony E-mount mirrorless cameras.
Aperture: Fast maximum aperture of f/1.8, ideal for low-light photography, astrophotography, and achieving shallow depth of field.
Optical Design:
Features 14 elements in 12 groups.
Includes two Advanced Aspherical (AA) elements and three Extra-low Dispersion (ED) elements to minimize aberrations, distortion, and color fringing, ensuring high corner-to-corner resolution.
Employs a 9-blade circular aperture for smooth and natural-looking bokeh.
Sony's Nano AR Coating is applied to reduce flare and ghosting for crisp contrast.
A fluorine coating on the front element repels water, oil, and contaminants, making it easy to clean.
Autofocus (AF) System:
Equipped with a dual XD (eXtreme Dynamic) Linear Motor system for fast, precise, and quiet autofocus performance, even with high-speed camera bodies.
The AF system is also optimized for smooth and silent video recording.
Handling and Build:
Compact and lightweight design, weighing just 373g (13.2 oz), making it highly portable and well-balanced on E-mount bodies.
Features a dust- and moisture-resistant design for reliability in challenging outdoor conditions.
Includes a customizable focus hold button and an AF/MF switch on the lens barrel.
Aperture ring with click stops that can be de-clicked for silent and smooth aperture adjustments during video recording.
Linear Response MF provides a natural and direct feel for manual focusing.
Close-up Performance: Offers a minimum focusing distance of 0.19 m (0.63 ft) in AF mode and an even closer 0.18 m (0.59 ft) in manual focus mode.
Filter Size: Accommodates 67mm threaded filters.
Use Cases: Excellent for landscape, architecture, astrophotography, vlogging, and environmental portraits due to its ultra-wide field of view and fast aperture.