I bought this lens along with an Astro-Modified Sony a7 IV, but never got to use them. Here’s the Sony description. Sony FE 14mm f/1.8 GM. Aperture Range: f/1.8 to f/16. Two XA Elements, One Super ED Element. Nano AR II and Fluorine Coatings. XD Linear Motor AF, Internal Focus. Dust and Moisture-Resistant Construction. Pairing an ultra wide-angle focal length with an especially bright design, the FE 14mm f/1.8 GM from Sony is a fast and dynamic lens well-suited to landscape, nature, architectural, and astrophotography applications. Its extremely wide perspective is complemented by an f/1.8 maximum aperture for excellent performance in low-light conditions and its impressively compact form factor makes it a portable and versatile option for everything from casual walkaround shooting to staged architectural shoots. Rare for an ultra-wide, the f/1.8 maximum aperture is a useful asset for working in low-light conditions, such as for astrophotography applications and when making timelapses where shorter shutter speeds are required. The optical design has been optimized for shooting wide open; the integrated high-curvature XA elements minimize sagittal flare for cleaner, more accurate nighttime sky and point light source rendering.