Optional Ring Adapter with inserts allow to mount unit onto the objective of the day scope (56...58.7mm diameter) without light suppressor. For example: 56 - Zeiss 2.5-10x50 57 - Shmidt & Bender 3-12x50 58,7 - Leupold 4.4-14x50, Leupold VX-III 3.5-10x