Samyang AF 24mm f/1.8 FE - Sony E-mount

The Samyang AF 24mm f/1.8 FE is a compact wide-angle prime specifically optimised for astrophotography on Sony full-frame cameras. A standout feature is the 'Astro-Focus Mode' with an LED indicator that signals when the lens is focused at infinity. It is weather-sealed at five points and includes a customisable switch and focus hold button. Optically, it uses 11 elements in 8 groups, including specialized glass to control coma and chromatic aberration, ensuring sharp star points across the image. Check that the LED indicator and the Astro-Focus button function correctly, as these are unique electronic components. The custom switch should click firmly between positions. SDS inspects the weather sealing mounts for signs of degradation and tests the autofocus motor for silent operation. Because this lens is lightweight and often used outdoors, the barrel and mount should be checked for signs of grit or moisture ingress, although the sealing is designed to prevent this.