https://www.edmundoptics.com.tw/p/unifoc-76-focusing-tube-for-sensors-larger-than-433mm-m58/17678/
Unifoc-76 Focusing Tube for Sensors Larger than 43.3mm, M58
Schneider Macro Imaging Lenses ideal for large format imaging sensors and macro imaging applications with reversible feature are available at Edmund Optics
larger thanfocusingtube