SM20 Research-Grade Stereo Microscope
Model: SM20A research-grade stereo microscope with a 20:1 zoom ratio, covering everything from a low-power overview to high-power detail on a single instrument — for life science research and precision industrial inspection.
Specifications
| Optical system | Parallel (CMO, Galilean) optical system |
|---|---|
| Head | Trinocular, visual/photo split 100:0 / 80:20 |
| Interpupillary | 55-75mm; one tube adjusts 180° vertically, 130mm viewing height range |
| Zoom ratio | 20:1 |
| Zoom range | 0.75X-15X (7.5X-150X total with standard 1X plan apochromat) |
| Detents | 11 positions: 0.75, 1, 2, 3, 4, 5, 6, 8, 10, 12, 13.5, 15 |
| Eyepiece | 10X/25 with ±5 dioptre adjustment (standard); 15X/16, 20X/13 (optional) |
| Objectives | Plan apochromat 0.5X N.A.0.075 WD71mm; 1X N.A.0.16 WD60mm; 1.6X N.A.0.24 WD30mm; 2X N.A.0.32 WD20mm |
| Objective mount | M61×1 thread |
| Max field of view | 33.3mm |
| Max resolution | 900 lp/mm |
| Max depth of field | 2.8mm |
| Stand | Upright transmitted-LED base |
| Focusing | Coaxial coarse/fine, adjustable tension, 120mm travel |
| Illumination | Transmitted LED with oblique contrast adjustment and aperture switching; 10W ring reflected LED; 50,000+ hours |
| Optional | Darkfield illuminator, single and combined polarisers, ring fibre illuminator, gem clip, K-series sliding stage (φ95mm), X-Y moving stage (φ95mm) |
Features
- 20:1 continuous zoom — from low-power overview to high-power detail without changing objectives
- Plan apochromat objectives: low distortion, longer working distance
- Galilean optics for flat field and faithful colour reproduction
- One tube adjusts 180° vertically, giving a 130mm viewing-height range for different users
- 25mm wide-field eyepieces, maximum field of view over 33mm
- Coaxial coarse/fine focus with 120mm travel
- Transmitted LED with oblique contrast control for transparent and semi-transparent samples
- 10W ring reflected LED for bright, even, high-contrast illumination
- Expandable with darkfield, polarising and fluorescence accessories; supports Moticam imaging
Applications
- Live observation of model organisms (Drosophila, C. elegans, zebrafish)
- Embryology and developmental biology
- Insect dissection and morphology
- Precision parts and 3D structure inspection
- High-reflectance surface examination
- Jewellery, textiles and forensic evidence
Frequently Asked Questions
What does a 20:1 zoom ratio mean?
Continuous adjustment from 0.75X to 15X without changing objectives, so you move from a whole-sample overview to local detail in one instrument.
What is the maximum magnification?
7.5X to 150X in total with the standard 1X plan apochromat; adding a 2X objective reaches 300X for solder joints, hair cuticle or textile fibres.
What is the working distance?
60 mm with the 1X objective and 71 mm with the 0.5X, leaving room for soldering, dissection and micromanipulation.
Can darkfield and polarising accessories be added?
Yes: darkfield illuminator, simple and compound polarisers, ring fibre-optic light guide, gem clamp and X-Y stage.
Want the full specification sheet?
Leave a number and we will send the specification sheet and a quotation for the SM20 Research-Grade Stereo Microscope. Calls returned within 10 minutes on working days.