Ocular eyepiece with 4 times magnification for the next InfiRay clip-ons:
InfiRay Mate MAL25 / MAL38 / MAH50
InfiRay Clip CH50 V2.0 / CH50 W
InfiRay Clip CL42
It's really easy to use. It can be used on the outer thread of the back side of the clip-on.
It can be fixed very stable and lends a thermal monocular appearance. Through it's magnification it can be used for longer distances with good details.