Reference: Specifications of Objective Threads
1. Scope: These specifications are applied to the threads of Mitutoyo microscope objectives. 2. The thread forms and dimensions are specified as follows conforming to JIS B-7141-1994.
Standard thread
External thread
Permissible range External thread
P
Permissible range
Standard thread
Internal thread
55°
External thread
Standard thread
Bright-field objectives Measuring microscope/centering microscope objectives
Nominal dimensions
Permissible limits of size and dimensional tolerance
Unit: mm
Unit: mm
External thread
External thread
Internal thread
Thread peak & valley curvature radius R
Applicable dimensions
Root diameter (d 1 )
OD (d)
Pitch diameter (d 2 )
OD (d)
Pitch diameter (d 2 )
Root diameter (d 1 )
Root diameter (D)
Pitch diameter (D 2 )
ID (D 1 )
Nominal thread diameter
Pitch
Number of threads (per 25.4 mm) n
Max. limit 25.896 25.502 25.050 26.076 25.624 25.230 Min. limit 25.820 25.426 24.974 26.000 25.548 25.154 Upper tolerance −0.104 −0.046 −0.046 +0.076 +0.076 +0.134 Lower tolerance −0.180 −0.122 −0.122 0 0 +0.058
Internal thread Pitch diameter (D 2 )
Permissible limits
P
ID (D 1 )
Root diameter (D)
Dimensional tolerance
26
36
0.706
0.097
26.000 25.548 25.096
Bright/dark-field objectives
Nominal dimensions
Permissible limits of size and dimensional tolerance
Unit: mm
Unit: mm
External thread
Internal thread
External thread
Thread peak & valley curvature radius R
Applicable dimensions
OD (d)
Pitch diameter (d 2 )
Root diameter (d 1 )
Root diameter (D)
Pitch diameter (D 2 )
ID (D 1 )
Root diameter (d 1 )
OD (d)
Pitch diameter (d 2 )
Nominal thread diameter
Pitch
Number of threads (per 25.4 mm) n
Max. limit 39.896 39.502 39.050 40.076 39.624 39.230 Min. limit 39.820 39.426 38.974 40.000 39.548 39.154
Permissible limits
Internal thread Pitch diameter (D 2 )
P
ID (D 1 )
Root diameter (D)
Upper tolerance −0.104 −0.046 −0.046 Lower tolerance −0.180 −0.122 −0.122
+ 0.076
+ 0.076
+ 0.134
Dimensional tolerance
40
36
0.706
0.097
40.000 39.548 39.096
0
0
+ 0.058
Mitutoyo’s long working-distance objectives are grouped by working wavelength range: ultraviolet, near-ultraviolet, visible, and near-infrared. The M Plan UV series (for ultraviolet), M Plan Apo NUV series (for near-ultraviolet), and M Plan Apo NIR series (for near-infrared) are designed especially for YAG laser working applications in cutting thin films. Each series is designed for optimal spectral transmission factor within its respective wavelength range. Reference: Transmission of Mitutoyo Objectives
M (BD) Plan Apo series: Wavelength range 436 nm to 656 nm M Plan Apo NIR series: Wavelength range 480 nm to 1800 nm M Plan Apo NUV series: Wavelength range 355 nm to 620 nm M Plan UV series: Optimized for wavelengths of 266 nm and 550 nm
Spectral transmission characteristics of 100X objective
Spectral transmission characteristics of M Plan UV 80X 100
100
M Plan Apo NIR 100x M Plan Apo SL 100x M Plan Apo NUV 100x
80
80
60
60
40
40
20
20
0
0 200 266 300
550
1800
300
600
900
1200
1500
400
500
600
700
800
Wavelength (nm)
Wavelength (nm)
N.A.: Numerical aperture W.D.: Working distance f: Focal length R: Resolving power DOF: Depth of field FOV: Real field of view
40
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