Bell & Howell Trionar projector lens adapter

This is a projector lens adapter. Right now it has a Nikon F-Mount connector but I may upload a Sony E-mount connector in the future.

This will let you use an older Bell & Howell 4" Trionar Anastigmat ƒ/3.5 projector lens on a digital camera. Just screw the lens into the adapter and twist to focus. Often produces very flat backgrounds but if you can get some point highlights just right it does some dramatic soap bubble bokeh.

By default the 4" Trionar is a macro lens on Nikon. Only focuses