Changing Magnification on EM Series Stereo Microscopes

Changing the magnification on your Meiji Stereo Microscope is relatively easy. What really needs to be considered is which method to use. On the one hand, you can change your eyepieces. On the other, you can add an auxiliary lens to the bottom of the scope. If you change your standard 10X eyepieces, you can increase your overall magnification without changing your working distance ( the space between the lens and the specimen).


By adding an auxiliary lens, you can either increase or decrease magnification however the working distance will change. Reduction lenses (1.0X or less) increase working distance whereas the 1.5X and 2.0X lenses decrease the working distance significantly. The charts below cover all our EM Series Models. It can help you decide eyepiece and auxiliary lens combinations. Notice the column is designated "Working Distance". Each yellow row is your model without auxiliary lenses. Note the working distance listed. Notice that no matter which eyepiece set you use, the working distance remains the same.


If you want to increase magnification and a shorter working distance does not cause a problem, then adding an auxiliary lens may be the best route for you. Since the optics are now physically closer to the specimen, you will get better image resolution.


So why doesn't everyone just add auxiliary lenses and forget eyepieces ?


Well, the one obvious reason is working distance. Stereo microscopes are used for all kinds of production and inspection work in all kinds of industries. Some applications require the working distance to be long enough to get a particular specimen to fit or be able to work with your hands under the microscope in the field of view. The downside of using higher magnification eyepieces is a smaller field of view (FOV) or field diameter (FN).

 
Magnification Table for Zoom Bodies
Model Zoom Range Aux Lens Working Distance (mm) SWF10X
Eyepieces		 SWF12.5X
Eyepieces		 SWF15X
Eyepieces		 SWF20X
Eyepieces		 SWF30X
Eyepieces
Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm)
EMZ-1 1X -3X none 93 10X ~ 30X 23 ~ 7.7 12.5X ~ 37.5x 20 ~ 6.6 15X ~ 45X 15.4 ~ 5.1 20X ~ 60X 11.5 ~ 3.8 30X ~ 90X 7.7 ~ 2.5
0.3X 251 3X ~ 9X 76 ~ 25.6 3.75X ~ 11.25X 66 ~ 22 4.5X ~ 13.5X 51.3 ~ 17 6X ~18X 38 ~ 12.6 9X ~ 27X 25.5 ~ 8.3
0.44X 181 4.4X ~ 13.2X 52 ~ 17.5 5.5X ~ 16.5X 45 ~ 15 6.6X ~ 19.8X 35 ~ 11.5 8.8X ~ 26.4X 26 ~ 8.6 13.2X ~ 39.6X 17.5 ~ 5.6
0.5X 150 5X ~ 15X 46 ~ 15.3 6.25X ~ 18.75X 40 ~ 13.2 7.5X ~ 22.5X 30.6 ~ 10.2 10X ~ 30X 23 ~ 7.6 15X ~ 45X 15.4 ~ 5
0.75X 97 7.5X ~ 22.5X 30.6 ~10.2 9.37X ~ 28.1X 26.6 ~ 8.8 11.25X ~ 33.75X 20.5 ~ 6.8 15 ~ 45X 15 ~ 5.0 22.5X ~ 67.5X 10.2 ~ 3.3
1.5X 49 15X ~ 45X 15.3 ~ 5.1 18.75X ~ 56.25X 13.3 ~ 4.4 22.5X ~ 67.5X 10.2 ~ 3.4 30X ~ 90X 7.7 ~ 2.5 45X ~135X 5.1 ~ 1.6
2.0X 34 20X ~ 60X 11.5 ~ 3.8 25X ~ 75X 10 ~ 3.3 30X ~ 90X 7.7 ~ 2.6 40X ~ 120X 5.7 ~ 1.9 60X ~ 180X 3.8 ~ 1.2
EMZ-2

EMZ-2TR

EMZ-5

EMZ-5TR

EMZ-9
0.7X~ 4.5X		 none 93 7X ~ 45X 32.8 ~ 5.1 8.75X ~ 56.25X 28.5 ~ 4.4 10.5X ~ 67.5X 22 ~ 3.4 14X ~ 90X 16.4 ~ 2.5 21X ~ 135X 11 ~ 1.7
0.3X 251 2.1X ~ 13.5X 109 ~ 17 2.62X ~ 16.87X 95 ~ 14.6 3.15X ~ 20.25X 73 ~ 11.4 4.2X ~ 27X 54.7 ~ 8.5 6.3X ~ 40.5X 36.6 ~ 5.7
0.44X 171 3.08X~ 19.8X 74.5 ~ 11.5 3.85X ~ 24.75X 64.7 ~ 10 4.62X ~ 29.7X 50 ~ 7.7 6.16X ~ 39.6X 37.2 ~ 5.9 9.24X ~ 59.4X 25 ~ 3.8
0.5X 148 3.5X ~ 22.5X 65.7 ~ 10.2 4.37X ~ 28.12X 57 ~ 8.8 5.25X ~ 33.75X 44 ~ 6.8 7X ~ 45X 32.8 ~ 5.1 10.5X ~ 67.5X 22 ~ 3.4
0.75X 97 5.25X~ 33.75X 43.8 ~ 6.8 6.56X ~ 42.18X 38 ~ 5.8 7.87X ~ 50.62X 29.3 ~ 4.5 10.5X ~ 67.5X 21.9 ~ 3.4 15.75X ~ 101.25X 14.6 ~ 2.2
1.5X 49 10.5X~ 67.5X 21.9 ~ 3.4 13.12X ~ 84.37X 19 ~ 2.9 15.75X ~ 101.25X 14.6 ~ 2.2 21X ~ 135X 10.9 ~ 1.7 31.5X ~ 202.5X 7.3 ~ 1.1
2.0X 33 14X ~ 90X 16.4 ~ 2.5 17.5x ~ 112.5X 14.2 ~ 2.2 21X ~ 135X 11 ~ 1.7 28X ~ 180X 8.2 ~ 1.2 42X ~ 270X 5.5 ~ 0.8
EMZ-6 0.62X~ 4.2X none 108 6.5X ~ 42X 35 ~ 5.4 8.12X ~ 52.5X 30.7 ~ 4.7 9.75X ~ 63X 23.7 ~ 3.6 13x ~ 84X 17.7 ~ 2.7 19.5X ~ 126X 11.8 ~ 1.8
0.5X 180 3.25X ~ 21X 70 ~ 10.8 4.0X ~ 26.2X 61.4 ~ 9.4 4.87X ~ 31.5X 47.4 ~ 7.2 6.5X ~ 42X 35.4 ~ 5.4 9.75X ~ 63X 23.6 ~ 3.6
EMZ-10
Z-7100		 0.7X~  4.5X none 110 7X ~ 45X 32.8 ~ 5.1 8.75X ~ 56.25X 28.5 ~ 4.4 10.5X ~ 67.5X 22 ~ 3.4 14X ~ 90X 16.4 ~ 2.6 21X ~ 135X 11 ~ 1.7
0.3X 326 2.1X ~ 13.5X 109 ~ 17 2.62X ~ 16.87X 95 ~ 14.6 3.15X ~ 20.25X 73 ~ 11.3 4.2X ~ 27X 54.6 ~ 8.6 6.3X ~ 40.5X 36.6 ~ 5.7
0.44X 247 3.08X~ 19.8X 74.5 ~ 11.5 3.85X ~ 24.75X 64.7 ~ 10 4.62X ~ 29.7X 50 ~ 7.7 6.16X ~ 39.6X 37.2 ~ 5.9 9.24X ~ 59.4X 25 ~ 3.8
0.5X 194 3.5X ~ 22.5X 65.6 ~ 10.2 4.37X ~ 28.12X 57 ~ 8.8 5.25X ~ 33.75X 44 ~ 6.8 7X ~ 45X 32.8 ~ 5.1 10.5X ~ 67.5X 22 ~ 3.4
0.75X 127 5.25X~ 33.75X 43.8 ~ 6.8 6.56X ~ 42.18X 38 ~ 5.8 7.87X ~ 50.62X 29.3 ~ 4.5 10.5X ~ 67.5X 21.8 ~ 3.4 15.75X ~ 101.25X 14.6 ~ 2.2
1.5X 64 10.5X~ 67.5X 21.8 ~ 3.4 13.12X ~ 84.37X 19 ~ 2.9 15.75X ~ 101.25X 14.6 ~ 2.2 21X ~ 135X 10.9 ~ 1.7 31.5X ~ 202.5X 7.3 ~ 1.1
2.0X 44 14X ~ 90X 16.4 ~ 2.5 17.5X ~ 112.5X 14.2 ~ 2.2 21X ~ 135X 11 ~ 1.7 28X ~ 180X 8.2 ~ 1.2 42X ~ 270X 5.5 ~ 0.8
EMZ-12 EMZ-12TR 0.4X~ 2.5X none 185 4X ~ 25X 57 ~ 9.2 5X ~ 31.2X 50 ~ 8 6X ~ 37.5X 38.5 ~ 6.1 8X ~ 50X 28.7 ~ 4.6 12X ~ 75X 19.2 ~ 3
0.7X 233 2.8X ~ 17.5X 82.1 ~ 13.1 3.5X ~ 21.8X 71.4 ~ 11.4 4.2X ~ 26.2X 55 ~ 8.8 5.6X ~ 35X 41 ~ 6.5 8.4X ~ 46.2X 27.5 ~ 4.4
EMZ-13

EMZ-13TR

EMZ-13VX		 1X~ 7.0X none 90 10X ~ 70X 22.0 ~ 3.14 12.5X ~ 87.5X 17.6 ~ 2.51 15X ~ 105X 14.66 ~ 2.09 20X ~ 140X 11.0 ~ 1.57 30X ~ 210X 7.33 ~ 1.04
0.3X 230 3X ~ 21X 73.33 ~ 10.47 3.75X ~ 26.25X 58.6 ~ 8.38 4.5X ~ 31.5X 48.88 ~ 6.98 6.0X ~ 42.0X 36.6 ~ 5.23 9.0X ~ 63.0X 24.4 ~ 3.49
0.44X 167 4.4X ~ 30.8X 50.0 ~ 7.13 5.5X ~ 38.5X 40 ~ 4.5 6.6X ~ 46.2X 33.1 ~ 4.5 8.8X ~ 61.6 25.0 ~ 3.5 13.2X ~ 92.4X 16.5 ~ 2.3
0.5X 139 5X ~ 35X 44.0 ~ 6.28 6.25X ~ 43.75X 35.2 ~ 5.02 7.5X ~ 52.5X 29.3 ~ 4.19 10X ~ 70X 22.0 ~ 3.14 15X ~ 105X 14.6 ~ 2.09
0.75X 92 7.5X ~ 52.5X 29.3 ~ 4.19 9.37X ~ 65.62X 23.47 ~ 3.35 11.25X ~ 78.75X 19.55 ~ 2.79 15X ~ 105X 14.66 ~ 2.09 22.5X ~ 157.5X 9.77 ~ 1.39
1.5X 48 15X ~ 105X 14.6 ~ 2.09 18.75X ~ 131.25X 11.73 ~ 1.67 22.5X ~ 157.5X 9.77 ~ 1.39 30X ~ 210X 7.33 ~ 1.04 45X ~ 315X 4.88 ~ 0.69
2.0X 32 20X ~ 140X 11.0 ~ 1.57 25X ~ 175X 8.8 ~ 1.25 30X ~ 210X 7.33 ~ 1.04 40x ~ 280x 5.5 ~ 0.78 60X ~ 420X 3.66 ~ 0.52
Model Zoom Range Aux Lens Working Distance (mm) SWF5X
Eyepieces		 SWF7.5X
Eyepieces		 SWF10X
Eyepieces		 SWF15X
Eyepieces		 SWF20X
Eyepieces
Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm)
EMZ-8TR

EMZ-8TRD

EMZ-8U

EMZ-8UD

EMZ-8

 0.7X~ 4.5X none 104 7X ~ 45X 32.8 ~ 5.1 8.75X ~ 56.25X 28.5 ~ 4.4 10.5X ~ 67.5X 22 ~ 3.4 14X ~ 90X 16.4 ~ 2.6 21X ~ 135X 11 ~ 1.7
0.28X 307 0.98X ~ 63.X 132.6 ~ 20.6 1.47X ~ 9.45X 122.4 ~ 19 1.96X ~ 12.6X 117.3 ~ 18.2 2.94X ~ 18.9X 78.5 ~ 12.2 3.92X ~ 25.2X 58.6 ~ 9.1
0.35X 250 2.45X ~ 15.75X 93.7 ~ 14.5 3.06X ~ 19.68X 81.4 ~ 12.5 3.67X ~ 23.62X 62.8 ~ 9.7 4.9X ~ 31.5X 46.8 ~ 7.4 7.35X ~ 47.25X 31.4 ~ 4.8
0.5X 174 3.5X ~ 22.5X 65.6 ~ 10.2 4.37X ~ 28.12X 57 ~ 8.8 5.25X ~ 33.75X 44 ~ 6.8 7X ~ 45X 32.8 ~ 5.1 10.5X ~ 67.5X 22 ~ 3.4
1.5X 57 10.5X ~ 67.5X 21.8 ~ 3.4 13.12X ~ 84.37X 19 ~ 2.9 15.75X ~ 101.25X 14.6 ~ 2.2 21X ~ 135X 10.9 ~ 1.7 31.5X ~ 202.5X 7.3 ~ 1.1

Magnification Table for Fixed, Turret and EXtended Bodies

Model Obj. Aux Lens Working Distance (mm) SWF10X Eyepieces SWF12.5X Eyepieces SWF15X Eyepieces SWF20X Eyepieces SWF30X Eyepieces
Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm) Total Mag. Field Diameter (mm)
EMF-1 1X none 108 10X 23 12.5X 20 15X 15.4 20X 11.5 30X 7.7
EMF-2 2X none 108 20X 11.5 25X 10 30X 7.7 40X 5.7 60X 3.8
EMT-1 EMTR-1 1X, 2X none 108 10X, 20X 23.0, 11.5 12.5X, 25X 20.0, 10.0 15X, 30X 15.3, 7.7 20X, 40X 11.5, 5.8 30X, 60X 7.6, 3.8
none 108 10X, 20X 23.0, 11.5 12.5X, 25X 20.0, 10.0 15X, 30X 15.3, 7.7 20X, 40X 11.5, 5.8 30X, 60X 7.6, 3.8
EMT-2 EMTR-2 1X, 3X none 81 10X, 30X 23.0, 7.6 12.5X, 37.5X 20.0, 6.6 15X, 45X 15.4, 5.1 20X, 60X 11.5, 3.8 30X, 90X 7.7, 2.5
0.5X 108 5X, 15X 46.0, 15.3 6.25X, 18.75X 40.0, 13.0 7.5X, 22.5X 30.8, 10.2 10X, 30X 23.0, 7.6 15X, 45X 15.4, 5.1
0.75X 72 7.5X, 22.5X 30.6, 10.22 9.37X, 28.12X 26.6, 8.8 11.25X, 33.75X 20.5, 6.8 15X, 45X 15.3, 5.1 2.5X, 67.5X 10.2, 3.4
1.5X 35 15X, 45X 15.3, 5.1 18.75X, 56.25X 13.3, 4.4 22.5X, 67.5X 10.2, 3.4 30X, 90X 7.6, 2.5 45X, 135X 5.1, 1.7
2.0X 21 20X, 60X 11.5, 3.8 25X, 75X 10.0, 3.3 30X, 90X 7.7, 2.5 40X, 120X 5.7, 1.9 60X, 180X 3.8, 1.2
EMT-3 EMTR-3 2X, 4X none 63 20X, 40X 11.5, 5.7 25X, 50X 10.0, 5.0 30X, 60X 7.7, 3.8 40X, 80X 5.7, 2.8 60X, 120X 3.8, 1.9
0.5X 108 10X, 20X 23.0, 11.5 12.5X, 25X 20.0, 10.0 15X, 30X 15.3, 7.6 20X, 40X 11.5, 5.7 30X, 60X 7.6, 3.8
0.75X 72 15X, 30X 15.3, 7.6 18.75X, 37.5X 13.3, 6.6 22.5X, 45X 10.2, 5.1 30X, 60X 7.6, 3.8 45X, 90X 5.1, 2.5
1.5X 35 30X, 60X 7.7, 3.8 37.5X, 75X 6.6, 3.3 45X, 90X 5.1, 2.5 60X, 120X 3.8, 1.9 90X, 180X 2.5, 1.2
2.0X 22 40X, 80X 5.7, 2.8 50X, 100X 5.0, 2.5 60X, 120X 3.8, 1.9 80X, 160X 2.8, 1.4 120X, 240X 1.9, 0.9
EMT-4 EMTR-4 1X, 4X none 63 10X, 40X 23.0, 5.7 12.5X, 50X 20.0, 5.1 15X, 60X 15.4, 3.8 20X, 80X 11.5, 2.8 30X, 120X 7.7, 1.9
0.5X 108 5X, 20X 46.0, 11.5 6.25X, 25X 38.0, 9.6 7.5X, 30X 30.8, 7.7 10X, 40X 23.0, 5.7 15X, 60X 15.4, 3.8
0.75X 72 7.5X, 30X 30.6, 7.6 9.37X, 37.5X 25.5, 6.5 11.25X, 45X 20.53, 5.1 15X, 60X 15.3, 3.8 22.5X, 90X 10.2, 2.5
1.5X 35 15X, 60X 15.3, 3.8 18.75X, 75X 13.1, 3.2 22.5X, 90X 10.2, 2.5 30X, 120X 7.6, 1.9 45X, 180X 5.1, 1.2
2.0X 22 20X, 80X 11.5, 2.8 25X, 100X 10.2, 2.3 30X, 120X 7.6, 1.9 40X, 160X 5.7, 1.4 60X, 240X 3.8, 0.9
EMX-1 0.5X, 1X none 225 5X, 10X 46.0, 23.0 6.25X, 12.5X 40.0, 20.0 7.5X, 15X 30.6, 15.3 10X, 20X 23.0, 11.5 15X, 30X 15.3, 7.6
0.7X 300 3.5X, 7X 69.0, 34.0 4.37X, 8.75X 61.0, 30.0 5.25X, 10.5X 48.5, 24.0 7X, 14X 35.0, 17.1 10.5X, 21X 22.0,11.0