The Sigma 20mm f/1.4 DG DN Art Sony E-mount is a versatile wide-angle lens that's suitable for landscape, architecture, and interior photography. This lens is optimized for full-frame Sony E-mount mirrorless cameras. Chromatic aberrations and lens distortions are stopped by special lens elements and ensure clear photos. The lens is light-sensitive, thanks to the maximum aperture of f/1.4. This way, you can take sharp photos in low-light. Thanks to the splash-proof coating, you can also use this lens under bad weather conditions. You can easily attach the lens heater to the lens. This prevents condensation on the inside of your lens. This appears during cold nights. So, this is a suitable lens for astrophotographers.