Nikon TC-17E II  type_Developing Tanks 5 AI Nikkor is a

5 AI Nikkor is a classic short telephoto lens for portraits or

Peer into the lensmount side and you can see the fixed prism that directs part of the light to the AF sensors

Feels real crappy in the hand but maybe that's cool now

Includes base and eyepiece caps

with minor cosmetic wear

Nikon TC-17E II &nbsptype_Developing Tanks 5 AI Nikkor is aThe Nikon TC 17E II is an autofocus teleconverter designed for select Nikon AF S telephoto lenses (here's Nikon's compatibility list). Provides a 1. 7x focal length boost, loses about a stop and a half of light. In good cosmetic condition, with minor paint and finish wear. Good optics and function. Includes caps.