AUC-635 Series Ergonomic Inverted Metallurgical Halogen Microscope with Brightfield / Darkfield Options
AUC-635 Series Ergonomic Inverted Metallurgical Halogen Microscope with Brightfield / Darkfield Options
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The AUC-635 Series comprises advanced inverted metallurgical microscopes designed for industrial research, materials inspection and quality control.
Its infinity-corrected optical system and long-working-distance metallurgical objectives provide clear, flat images across the field of view. Complete with
- Built-in objective-magnification sensor
- Magnification displayed on the front panel
The inverted configuration allows large, heavy or irregularly shaped specimens to be placed directly onto the spacious stage and observed from below.
A 360° rotatable trinocular viewing head, low-position controls and rackless mechanical stage provide comfortable operation during extended periods of use. The viewing head can also raise the eyepoint by up to 34 mm, helping users vary their working posture.

Both variants include simple polarising capability. Choose the AUC-635-I for brightfield and simple polarising observation or the AUC-635BD-I when brightfield, darkfield and simple polarising observation are required.
Key features
- Infinity colour-corrected optical system
- Inverted design for large or irregular specimens
- 45° inclined trinocular viewing head
- 360° rotatable viewing head
- Eyepoint height adjustment of up to 34 mm
- PL10×/22 mm high-eyepoint plan eyepieces
- Four infinity LWD metallurgical objectives
- Standard magnification range of 50×–500×
- Quintuple nosepiece with DIC slot
- Built-in objective-magnification sensor
- Magnification displayed on the front panel
- Large three-layer rackless mechanical stage
- Low-position focusing and stage controls
- 12 V/100 W reflected halogen illumination
- Centre-adjustable field and aperture diaphragms
- Polariser and 360° rotatable analyser included
- Intelligent ECO infrared sensing system
- Optional DIC attachment
- Optional focus-adjustable C-mount adapters
- Three-year Auckland Scientific warranty
Choose your configuration
AUC-635-I – Brightfield and Simple Polarising
The AUC-635-I is designed for brightfield examination and simple polarising observation.
Standard objective configuration
- 5× infinity LWD plan achromatic metallurgical objective
- 10× infinity LWD plan achromatic metallurgical objective
- 20× infinity LWD plan achromatic metallurgical objective
- 50× infinity LWD plan achromatic metallurgical objective
- Quintuple brightfield nosepiece with DIC slot and magnification sensor
The standard magnifications are 50×, 100×, 200× and 500× when used with the supplied 10× eyepieces.
AUC-635BD-I – Brightfield, Darkfield and Simple Polarising
The AUC-635BD-I adds darkfield observation for identifying surface defects, impurities, scratches and flaws that may be difficult to distinguish using brightfield illumination alone.
A control on the microscope enables switching between brightfield and darkfield observation.
Standard objective configuration
- 5× infinity LWD brightfield/darkfield plan achromatic objective
- 10× infinity LWD brightfield/darkfield plan achromatic objective
- 20× infinity LWD brightfield/darkfield plan achromatic objective
- 50× infinity LWD brightfield/darkfield semi-apochromatic objective
- Quintuple brightfield/darkfield nosepiece with DIC slot and magnification sensor
The standard magnifications are 50×, 100×, 200× and 500× when used with the supplied 10× eyepieces.
Variant comparison
| Feature | AUC-635-I | AUC-635BD-I |
|---|---|---|
| Brightfield observation | Included | Included |
| Darkfield observation | Not included | Included |
| Simple polarising | Included | Included |
| Standard objectives | 5×, 10×, 20× and 50× brightfield | 5×, 10×, 20× and 50× BF/DF |
| 50× objective type | Plan achromatic | Semi-apochromatic |
| Standard magnification | 50×–500× | 50×–500× |
| Nosepiece | Quintuple brightfield | Quintuple brightfield/darkfield |
| DIC slot | Included | Included |
| Magnification sensor | Included | Included |
| DIC equipment | Optional | Optional |
| C-mount adapter | Optional | Optional |
Standard objective specifications
AUC-635-I objectives
| Objective | Numerical aperture | Working distance |
|---|---|---|
| 5× LWD Plan Achromatic | 0.15 | 10.8 mm |
| 10× LWD Plan Achromatic | 0.30 | 12.2 mm |
| 20× LWD Plan Achromatic | 0.45 | 4.0 mm |
| 50× LWD Plan Achromatic | 0.55 | 7.9 mm |
AUC-635BD-I objectives
| Objective | Numerical aperture | Working distance |
|---|---|---|
| 5× LWD BF/DF Plan Achromatic | 0.15 | 9.0 mm |
| 10× LWD BF/DF Plan Achromatic | 0.30 | 9.0 mm |
| 20× LWD BF/DF Plan Achromatic | 0.45 | 3.4 mm |
| 50× LWD BF/DF Semi-Apochromatic | 0.55 | 7.5 mm |
Shared technical specifications
| Item | Specification |
|---|---|
| Optical system | Infinity colour-corrected optical system |
| Viewing head | 45° inclined trinocular, rotatable through 360° |
| Interpupillary distance | 50–75 mm |
| Light distribution | Binocular/trinocular: 100:0 or 0:100 |
| Eyepieces | PL10×/22 mm high-eyepoint widefield plan |
| Standard magnification | 50×, 100×, 200× and 500× |
| Nosepiece | Inward-facing quintuple with DIC slot and magnification sensor |
| Stage | Three-layer rackless mechanical stage |
| Stage dimensions | 240 × 250 mm |
| Stage movement | 50 × 50 mm |
| Stage control | Low-position right-hand control |
| Focusing | Low-position coaxial coarse and fine focusing |
| Focusing range | 9 mm: 6.5 mm upwards and 2.5 mm downwards |
| Fine-focus precision | 0.002 mm/2 µm |
| Diaphragms | Centre-adjustable field and aperture diaphragms |
| Illumination | Reflected 12 V/100 W halogen |
| Polarising equipment | Polariser and 360° rotatable analyser included |
| Standard filter | LBD colour filter |
| Standard stage plate | Metal plate with 12 mm centre opening |
| Power supply | External adapter, 100–240 V input |
| Adapter output | 15 V/13.4 A |
| Camera connection | Optional focus-adjustable C-mount adapter |
Ergonomic operation
The 360° rotatable viewing head allows the eyepoint height to be raised by up to 34 mm. Combined with the low-position focusing and stage controls, this helps users maintain a comfortable posture during extended observation.
Rackless mechanical stage
The 240 × 250 mm three-layer mechanical stage provides 50 × 50 mm controlled movement.
Its rackless X-Y mechanism is designed for smooth, comfortable operation while avoiding an exposed projecting rack. A transport-locking plate helps prevent unwanted stage movement while the microscope is being moved.
Front magnification display
A sensor built into the nosepiece detects the objective currently in use. Its magnification is shown on the microscope’s front display, allowing the user to confirm the selected objective without looking beneath the stage.
Intelligent ECO system
The integrated infrared sensor can automatically switch the microscope off when no operator is detected within the preset period.
This helps reduce unnecessary energy consumption and can extend the operating life of the illumination system.
Observation methods
Brightfield
Suitable for routine examination of polished metallurgical specimens, metals, alloys and other reflective materials.
Darkfield — AUC-635BD-I
Darkfield illumination increases the visibility of impurities, scratches, edges and surface flaws by presenting them brightly against a dark background.
Simple polarising
The included polariser and 360° rotatable analyser allow specimens to be viewed under different polarising orientations without repositioning the sample.
Differential interference contrast
An optional DIC attachment can be combined with the polarising equipment to increase contrast and provide a relief-like appearance. This can assist with detecting small variations in surface height on metallurgical materials, minerals and wafers.
Applications
- Forging and smelting research
- Heat-treatment inspection
- Raw-material examination
- Metallography
- Metals and alloys
- Surface-defect inspection
- Mineral examination
- Semiconductor wafers
- Industrial quality control
- Manufacturing and engineering
- Teaching and research
Standard equipment
Both variants include:
- Inverted metallurgical microscope body
- 45° inclined, 360° rotatable trinocular viewing head
- Pair of PL10×/22 mm eyepieces
- Model-specific set of four objectives
- Model-specific quintuple nosepiece
- Three-layer rackless mechanical stage
- Metal stage plate with 12 mm centre opening
- 12 V/100 W halogen light box and lamp
- Polariser
- 360° rotatable analyser
- LBD colour filter
- ECO infrared sensing system
- Magnification display
- M3 internal hexagonal spanner
- M4 internal hexagonal spanner
- External power adapter
- Power cable
- Dust cover
Optional accessories
- 100× infinity LWD objective
- DIC attachment
- PL10×/22 mm eyepiece with micrometer
- PL15×/16 mm eyepieces
- Glass stage plate
- Kidney-shaped metal stage plate
- Metal stage plate with 25 mm centre opening
- Blue filter
- Green filter
- Yellow filter
- 0.35× focus-adjustable C-mount adapter
- 0.5× focus-adjustable C-mount adapter
- 0.65× focus-adjustable C-mount adapter
- 1× focus-adjustable C-mount adapter
- Electronic-eyepiece connector
- Compatible microscope cameras
- Imaging and analysis software
Please contact Auckland Scientific if you require a camera, DIC equipment, alternative stage plate or complete imaging package.
Warranty
Covered by Auckland Scientific’s three-year microscope warranty.
The microscope must be serviced annually for the warranty to remain valid. Terms and conditions apply.