Samyang released firmware version 3 for the Samyang AF 135mm f/1.8 FE Lens to improve operation stability when the camera is powered on/off.
Samyang (branded Rokinon in US) AF 135mm f/1.8 FE Lens ($999 at B&H) is a medium-length telephoto prime lens designed for full-frame Sony E-mount mirrorless cameras for portraiture, landscapes and astrophotography.
Samyang AF 135mm f/1.8 FE Firmware 3
|Details||– Improved operation stability right after turning on/off|
You can download the update here.
See also this video review about the 3 Essential Sony Prime Lenses. These three lenses are Sony FE 24mm f/1.4 G Master (Bhphoto, Adorama, Amazon), Sony FE 14mm f/1.8 G Master (BHphoto, Adorama) and Sony FE 35mm f/1.4 G Master (BHphoto, Adorama, Amazon).