Godox Adapter Holder For Fresnel Flash Head AK-R25 The Godox Adapter Holder For Fresnel Flash Head AK-R25 offers you the option of using a square Godox flash head with the AK-R21 Projection Attachment The AK-R25 adapter makes it possible to connect the Godox AK-R21 attachment to flashes with rectangular heads. This allows creative lighting effects and the use of slides with, for example, camera flashes. The AK-R25 attachment as well as the flashes are available separately.