Mitutoyo arrived at the optimal combination of working distance and optical performance by using a new and original approach and by avoiding outdated conventions used by some competitors.
Making the objectives larger and longer (95mm parfocalization length) has eased the design burden.
Chromatic aberration is corrected for red, blue, and yellow by using an apochromatic objective lens as compared to a standard achromatic objective lens with correction for red and yellow only.
Objectives are strain-free and optimized for bright field illumination (incident illumination parallel to optical axis), making them ideal for in-line illumination applications.
Infinity correction is by way of a secondary or tube lens with a standardized focal length of 200 mm.
Finally all Mitutoyo M Plan objectives use 26 mm mounting threads with approximately 0.706 mm or 36 TPI pitch.
Please contact us with questions.