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Mitutoyo Infinity Corrected Long Working Distance Objectives

20X Mitutoyo Plan Apo SL Infinity Corrected Objective, #46-398
50X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-146
7.5X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #66-383
5X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-143
50X Mitutoyo Plan Apo HR Infinity Corrected Objective, #58-237
100X Mitutoyo Plan Apo HR Infinity Corrected Objective, #58-238
50X Mitutoyo Plan Apo SL Infinity Corrected Objective, #46-399
100X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-147
10X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-144
2X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-142
5X Mitutoyo Plan Apo HR Infinity Corrected Objective, #34-247
20X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-145
1X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #58-235

20X Mitutoyo Plan Apo SL Infinity Corrected Objective, #46-398

50X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-146

7.5X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #66-383

5X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-143

50X Mitutoyo Plan Apo HR Infinity Corrected Objective, #58-237

100X Mitutoyo Plan Apo HR Infinity Corrected Objective, #58-238

50X Mitutoyo Plan Apo SL Infinity Corrected Objective, #46-399

100X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-147

10X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-144

2X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-142

5X Mitutoyo Plan Apo HR Infinity Corrected Objective, #34-247

20X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #46-145

1X Mitutoyo Plan Apo Infinity Corrected Long WD Objective, #58-235


  • Long Working Distances
  • Bright Field Inspection
  • High Quality Plan Apochromat Design
  • Flat Image Surface over Entire Field of View

Mitutoyo’s 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 They have achieved the best combination of working distance and optical performance by using a new approach—avoiding outdated conventions used by competitors.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). In order to maintain as high an N.A. and contrast as possible, the lenses are all Plano Apochromats. An apochromatic objective lens is chromatic aberration corrected for red, blue, and yellow while a standard achromatic objective lens is only corrected for red and blue. Plano Apochromats are typically very expensive, but high volume production has made it possible to keep the cost down to that of standard Achromat long working distance objectives. Optimized for bright field illumination (incident illumination parallel to optical axis), these lenses are ideal for in-line illumination applications. For an infinity correction system, a secondary (or tube) lens is required. All stated magnifications are based on a tube lens focal length of 200mm. Mounting thread: M26 x 0.706 pitch (36 TPI).

M Plan Apo SL Series

  • Super-Long Working Distance for Bright Field Inspection
  • 13mm Working Distance for 100X and 200X Models
  • High Quality Apochromat Design
  • Flat Image Surface over Entire Field of View
  • Good Color Reproducibility

Accessory Tube Lenses

Accessory Tube Lenses and C-Mount Thread Adapters can be used to adapt the Mitutoyo objectives to additional configurations.

Edmund Optics is the main source for Mitutoyo Objectives. Place your orders now for these in demand quality products.

Technical Information

Dimensions (mm)
Stock No. M Plan Apo A B C D E F W.D.
#58-235 1X 84.0 - 38.0 - 41.0 34.0 11.0
#46-142 2X 61.0 1.4 27.5 24.7 32.2 34.0 34.0
#46-143 5X 61.0 1.6 25.0 23.0 32.2 34.0 34.0
#66-383 7.5X 60.0 - 25.0 24.0 32.2 34.0 35.0
#46-144 10X 61.0 2.0 28.2 - 32.2 34.0 34.0
#46-145 20X 75.0 1.5 29.2 - 32.2 34.0 20.0
#46-146 50X 82.0 1.5 29.2 - 32.2 34.0 13.0
#46-147 100X 89.0 4.7 29.2 17.8 32.2 34.0 6.0
Stock No.
M Plan Apo HR A B C D E F W.D.
#34-247 5X HR 69.5 3.7 24.8 - 32.2 34.0 25.5
#58-236 10X HR 80.0 7.5 29.0 26.0 37.0 39.0 15.0
#58-237 50X HR 89.8 2.0 28.2 - 32.2 34.0 5.2
#58-238 100X HR 93.7 2.0 28.2 - 32.2 34.0 1.3
Stock No.
M Plan APO SL A B C D E F W.D.
#46-398 20X SL 64.5 1.5 24.8 24.0 32.2 34.0 30.5
#46-399 50X SL 74.5 3.9 25.2 23.5 32.2 34.0 20.5
#46-401 100X SL 82.0 1.4 23.9 22.0 32.2 34.0 13.0

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