Shopper : Why Did You Choose This?DEBORAH B : The one I have is now sliding so flash heads don't stay in place. I could use an extra anyway for a Raynox add-on.GERALD M : To use on MF12 lightsJAMES G : Seems like the perfect accessory for my MF12 macro flash.MATTHEW H : So I could use the Flashpoint round head flash accessories.DOUGLAS F : Great accessory to experiment with.Joel J : TO BE ABLE TO USE HORIZONTAL FLASHES WITH ROUND MODIFIERS