Redshift faithfully translates the most commonly used parameters of the native 3ds Max camera object, so the camera view you see in 3ds Max's viewport will match exactly the view of your images rendered using Redshift.
Lens shaders are not used in 3ds Max. Instead effects normally achieved using Lens Shaders in Maya or Softimage have specialized UIs in 3ds Max.
Redshift Photographic Exposure is exposed in the "Exposure Control" section of the "Environment and Effects" window (Rendering > Exposure Control… from the main menu).
Redshift Bokeh and Redshift Lens Distortion are exposed in the "Effects" section of the "Environment and Effects" window (Rendering > Effects… from the main menu).
Fisheye / Spherical / Cylindrical / Stereo Spherical Cameras
In order to make a camera become a Fisheye, Spherical, Cylindrical or Stereo Spherical camera in Redshift for 3ds Max, you use the Redshift Camera Attributes modifier on a native 3ds Max camera object.