To create an Octane Panoramic camera in the plugin you need to create a spherical camera in Carrara.
The plugin will use the Carrara settings for the Zoom to determine a Horizontal Field of View that matches the Carrara Production Frame.
The plugin will also use the Carrara Distance to Near Plane setting to set the Octane Near clip depth.
Additional camera settings can be set in the Octane Panoramic effect.