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Description
Eliminating neck strain during continuous gemstone appraisals, the Motic GM-171 Gemological Binocular Microscope delivers parallel-beam optical accuracy on an ergonomic tilting stand. Powered by a Galilean Common Main Objective (CMO) optical train, it provides continuous 7.5x to 50x magnification via an expansive 1:6.7 zoom ratio (0.75x to 5.0x). The parallel light paths ensure zero convergence angle distortion, allowing gemologists to examine diamond inclusions and color zoning for hours without experiencing the eye fatigue common to converging optical systems.
The Siedentopf binocular viewing head sits at a comfortable 45-degree angle, paired with ultra-widefield N-WF 10x/23 mm high-eyepoint eyepieces featuring independent bilateral diopter adjustments across a 50 mm to 75 mm interpupillary span. Sub-stage darkfield illumination is powered by a 6V/30W quartz halogen bulb focused through an adjustable iris diaphragm that narrows from 41 mm down to 2 mm to eliminate perimeter glare. Exterior facet luster and surface characteristics are inspected under an overhead 7W cool white fluorescent lamp on a flexible gooseneck arm. Built on a 9.4 kg cast-metal frame that tilts from 0 to 45 degrees and rotates 360 degrees, it includes a professional stainless steel wire stone holder and a locking aluminum flight case.
Key Features of Motic GM-171 Gemological Binocular Microscope
A flagship binocular gemological stereo zoom microscope featuring parallel Galilean CMO optics and an ergonomic 0-to-45 degree tilting rotary base. Combines 7.5x to 50x magnification with an iris-controlled darkfield halogen well, overhead daylight fluorescent lighting, and ultra-wide 23 mm eyepieces.
- Parallel Galilean Common Main Objective (CMO) optical design for distortion-free stone grading
- Continuous 7.5x to 50x zoom magnification powered by a 1:6.7 zoom core (0.75x to 5.0x)
- Generous 110 mm operational working distance leaves ample room for gemological tweezers
- Integrated darkfield condenser well with adjustable iris diaphragm (41 mm down to 2 mm)
- Base-integrated 6V/30W quartz halogen bulb provides true color metrics for inclusion grading
- Overhead 7W fluorescent lamp on flexible metal gooseneck emits diffuse daylight spectrum
- Ergonomic gemological base tilts smoothly from 0 to 45 degrees with 360-degree rotation
- Ultra-widefield N-WF 10x/23 mm high-eyepoint eyepieces with bilateral diopter adjustments
Galilean Parallel Optics & Darkfield Halogen Well
Evaluating raw mineral crystals and cut diamonds requires optics that will not curve edge facets. The parallel Galilean layout routes dual optical corridors through a single Plan Achromatic master objective, keeping the focal plane completely flat across the entire 23 mm field number. The sub-stage 30W quartz halogen lamp throws intense, warm-spectrum light obliquely through the gem pavilion, making microscopic fractures, crystal inclusions, and growth lines resolve with sharp contrast.
Rotary Tilting Base & Daylight Fluorescent Illumination
The specialized gemological base tilts smoothly within a 45-degree arc and rotates a full 360 degrees on its turntable, letting appraisers inspect stones from natural seating angles without hunching. The 7W fluorescent gooseneck lamp provides diffuse daylight-balanced lighting across stone crowns, revealing true hue and saturation without the harsh reflections caused by point-source LEDs. Coaxial coarse focus knobs provide 125 mm of vertical stroke with integrated friction adjustment to stop carriage settling.
- Tilting base assembly promotes ergonomic posture during prolonged diamond appraisal shifts
- Diffuse 7W fluorescent gooseneck reveals true stone color traits without blinding hot spots
- Included aluminum transit case protects precision optics and mechanics during travel
Motic Five-Year Gemological Warranty Protection
Motic backs the GM-171 Binocular Gemology Core with a comprehensive five-year factory warranty covering optical elements, internal prism alignments, and tilting base mechanics, backed by two years on electrical components. The complete factory package contains the GM-171 gemology base and binocular Galilean head, 7W gooseneck fluo lamp, internal halogen block, professional stainless steel wire stone holder, diffuse lens attachment, vinyl dust cover, and aluminum industrial transit lock case.
Motic GM-171 Gemological Binocular Stereo Zoom Microscope 7.5x-50x Working Distance 110mm Specs
| Brand | Motic |
| Full Model Code / SKU | GM-171 Binocular Gemology Core (Flagship High-Performance Optical Workspace) |
| Country of Origin | Germany / China |
| Microscope Type | Flagship Binocular Gemological Stereo Zoom Microscope utilizing advanced Galilean optical systems for true parallel beam performance |
| Optical System Type | Common Main Objective (CMO) Galilean Optical System delivering parallel optical paths to eliminate fatigue and ensure distortion-free fields |
| Observation Tube Type | Binocular Head Unit, Siedentopf type incorporating premium internal mechanical optical alignment prism rails |
| Tube Inclination & Rotation | Comfortable 45° viewing posture tilt, 360° rotating head section, 50-75 mm interpupillary distance tracking adjustability |
| Eyepiece / Field of Number | N-WF 10x / 23 mm (Extra-wide field high-eyepoint ocular modules with independent diopter adjustment rings on both tubes) |
| Nosepiece Design | Continuous zoom optical turret layout driven by a large 1:6.7 ratio bilateral side-mounted control dial |
| Objectives Classification | Plan Achromatic Common Main Objective System with high numerical apertures and absolute geometric distortion correction |
| Objectives Magnification Breakdown | Continuous zoom objective ratio tracking across a 0.75x to 5.0x scaling path |
| Total Magnification Range | Continuous zoom from 7.5x up to 50x parameters with standard 10x eyepieces |
| Focusing Type & Graduation | Heavy-duty coarse focusing system with integrated mechanical tension tuning adjusters; complete focusing stroke range exactly 125 mm |
| Stage Dimensions & Surface Coating | Specialized multi-functional gem stage block measuring 306 x 236 mm with dual-sided mounting threads for auxiliary holding tools |
| Stage Travel Range & Controls | Extended base assembly tracking a full 0° to 45° comfort incline tilt range alongside a complete 360° rotary base layout |
| Condenser Type & Numerical Aperture | Integrated adjustable darkfield iris diaphragm assembly controlling light fields across a Ø41 mm down to Ø2 mm opening profile |
| Illumination Transmitted Type | Base integrated 6V / 30W Quartz Halogen transmissive bulb for precise deep brightfield and darkfield inclusion mapping |
| Illumination Epi-EPI/Reflected | Top frame mounted 7W cool white fluorescent lamp module tracking over a highly flexible, position-retaining metal gooseneck arm |
| Light Intensity Management | Base integrated electronic variable analog rotary potentiometer layout for smooth brightness logging controls |
| Camera Port / C-Mount Adapter Split | None (Dedicated dual eye binocular optical pathway tracking paths) |
| Contrast Methods Capability | Advanced Galilean darkfield inclusion tracking, transmitted parallel-beam brightfield analysis, polarization testing, critical surface metric tracking |
| Power Supply & Voltage Input | Internal universal switching auto-voltage power state system accepting 100-240V AC electrical currents |
| Physical Dimensions & Net Weight | Chassis depth 391 mm, profile width 236 mm, complete assembly height 515 mm, structure net weight exactly 9.4 kg |
| Standard Package Accessories Included | GM-171 gemology base and binocular Galilean head, 7W gooseneck fluo lamp, internal halogen block, professional stainless steel wire stone holder, diffuse lens attachment, vinyl dust cover, aluminum industrial transit lock case |
| Primary Application & Environment | Elite gemological research laboratories, state diamond grading offices, master appraisal workbenches, commercial raw gemstone import analysis centers |
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