The Nikon Nikkor-W 240mm f/5.6 is an incredibly sharp, high contrast lens that provides amazing detail for large format photography.  It easily covers 4x5” to 11x14” film.  Well made and the pride of many large format photographers.

They can be purchased second hand, but may not always come with the required spacing ring needed for mounting the lens on a large format lens board.

Below are two versions for making the spacer.  Feel free to drag and copy.