Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Camera Type
REDSHIFT_CAMERA_TYPE
Parameter: FOV
REDSHIFT_CAMERA_FISHEYE_ANGLE
Parameter: Horizontal Scale
REDSHIFT_CAMERA_FISHEYE_SCALE_X
Parameter: Vertical Scale
REDSHIFT_CAMERA_FISHEYE_SCALE_Y
Parameter: Orthographic Cylindrical
REDSHIFT_CAMERA_CYLINDRICAL_ORTHOGRAPHIC
Parameter: Horizontal FOV
REDSHIFT_CAMERA_CYLINDRICAL_FOVH
Parameter: Vertical FOV
REDSHIFT_CAMERA_CYLINDRICAL_FOVV
Parameter: Orthographic Height
REDSHIFT_CAMERA_CYLINDRICAL_ORTHOGRAPHIC_HEIGHT