An accessory ring which converts the lens mount of your SLR camera to a T-Mount. The compatible Opteka T-Mount System makes it possible to use most any single lens reflex camera in combination with various front camera attachments such as telescopes, mirror lenses, slide duplicators...etc. The T-Mount is a metal connector that screws onto the compatible front attachment and allows this combination to be coupled to your SLR camera lens mount. 

Compatible with all Nikon 1 Cameras:
Nikon1 AW1, J3, J4, J5, S1, S2, V3,