I think you'll find that when you remove the grey outer trim frame/ring to install ND filters, that the OEM frame/ring does not have a lens. The piece of protective glass is actually attached to and remains with the camera.Funny, mine has a clear lens cover mounted to the lens.
Anyone know why and if we are not using filters does the no glass frame need to be attached
Ah ha makes perfect sense to me now.Technically no, but the frame plugs up the mounting holes on the gimbal so it probably keeps dust and dirt from going inside.