These objectives are world-renowned for setting the standard of excellence for long working distance microscope optics. 
They have achieved the best combination of working distance and optical performance by using a new approach—avoiding outdated conventions used by competitors. 
Making the objectives larger and longer has made the designs easier (95mm parfocalization length). 
For an infinity corrected system, a secondary (or tube) lens is required. 
All stated magnifications are based on a tube lens focal length of 200mm. 
Works with all Mitutoyo parts and can be placed directly in a system currently utilizing Mitutoyo objectives.

NIR objectives:

http://bwoptics.com/proend.asp?id=200
 

NUV objectives:

http://bwoptics.com/proend.asp?id=199