23mm lens holder allows a prescription lens to be fitted eye-side of your rearsight manufactured exclusively for our own latest irises with a detachable front thread and not carrying our 1.5x magnified diopter The detachable steel front thread of your iris is removed with the factory spanner 501's adaptor thread is then screwed into the front of your Gehmann iris 501, now with your iris mounted, is screwed into your rearsight after loosening the rail carrier's allen screw Mount your prescription lens in the lens holder which may be slid off the rail for easier assembly Reposition the lens holder on the rail as required and lock it in place Positioning of the assembly on your rearsight is easily set as the attachment boss has radial adjustment and is simply secured with the allen screw located in the front body

23mm lens holder allows a prescription lens to be fitted eye-side of your rearsight For all other manufacturers irises and our own earlier versions that didn't have the ability to remove the front attachment thread Mount your prescription lens in the lens holder which may be slid off the rail for easier assembly Reposition the lens holder on the rail as required and lock it in place Positioning of the assembly on your rearsight is easily set as the attachment boss has radial adjustment and is simply secured with the allen screw located in the front body