Greenough optical system offers a 6.5:1 zoom ratio and provides exceptional image quality and excellent depth of field. The binocular or trinocular stereo zoom body includes the following:
- Body:  Binocular with rugged all-metal body design, rotatable 360°. Trinocular version has a beam splitter that directs light to the right eyetube and trinocular port simultaneously.
- Objective Zoom Range:  0.7x - 4.5x.
- Magnification:  7x - 45x (when using 10x eyepieces - MA502). View the magnification chart below to determine which eyepieces and auxiliary lens you may need.
- Field of View:  32mm at 7x, 5.1mm at 45x.
- Working Distance:  93mm.
- Eyetube Inclination:  45°.
- Interpupillary Distance Adjustment:  54mm - 75mm.
- Dioptric Adjustment:  Both eyetubes.
- Extended Magnification Range:  2.1x - 270x.
- Extended Working Distance:  34mm - 251mm (with optional auxiliary lens).
 
| Meiji Stereo Microscope Magnification Chart | 
| 
| AuxLens
   | WorkingDist.
 (mm)
 | SWF10xEyepieces
 | SWF12.5xEyepieces
 | SWF15xEyepieces
 |   SWF20xEyepieces
 |   SWF30xEyepieces
 |  
|  |  |  |  |  |  |  |  |  |  |  
| 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
 |  | 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
 |  |