I've always had the opinion that multicoating is -way- overrated. Multicoating will not stop you from getting the hexagons. Careful camera positioning and use of the Hollywood "gobo" or "go between" for efficent shading in extreme conditions works well for me. Just cast a shadow on the front element, with a hat (or your hand!), or whatever is handy, just out of the camera frame. Now -that- makes a huge difference!