Leica DM750 Biological Microscope

Overview

The Leica DM750 is a high-performance upright biological microscope engineered for routine education, clinical diagnostics, and entry-level research applications. Built on Leica Microsystems’ proven optical architecture—shared with its advanced research-grade platforms—the DM750 delivers exceptional image fidelity, contrast uniformity, and long-term stability without requiring oil immersion for high-magnification observation. Its optical design incorporates the Harmonic Contrast System (HCS), a proprietary correction methodology that balances brightness, contrast, and chromatic fidelity across all magnifications. Coupled with Brightness Synchronized Objectives—lens sets calibrated to maintain consistent illumination intensity regardless of magnification—the system ensures rapid, intuitive transitions between objectives while preserving optimal signal-to-noise ratio. The microscope employs a fixed 100× dry objective (NA 0.8), eliminating immersion oil handling while sustaining resolution sufficient for subcellular morphology assessment in stained or live unstained specimens.

Key Features

• EZStore™ Ergonomic Transport Design: Integrated vertical handle and front-mounted grip groove enable two-handed, stable lifting and placement—even onto elevated storage shelves—reducing operator fatigue and mechanical stress on optical components.
• EZLite™ LED Illumination: Cold-white, 5,000 K LED light source with >15,000-hour service life; delivers uniform Köhler illumination across the full field of view without manual intensity rebalancing or bulb replacement.
• SafeTStage™ Self-Supporting Mechanical Stage: Rigid, cantilevered construction eliminates protruding stage support arms, minimizing risk of finger entrapment or accidental collision during multi-instrument bench setups.
• EZTube™ Integrated Eyepiece Assembly: Pre-aligned, pre-focused eyepiece-tube unit with factory-set diopter compensation; prevents misalignment-induced visual strain and ensures immediate usability upon installation.
• AgTreat™ Antimicrobial Surface Treatment: Silver-ion infused polymer coating applied to all high-contact surfaces (focus knobs, stage controls, eyepiece housing) to inhibit bacterial colonization per ISO 22196:2011 standards.
• EZGuide™ Slide Support System: Low-profile, spring-damped slide holder with recessed edge guides prevents lateral displacement and minimizes fracture risk during coarse focusing or rapid stage movement.

Sample Compatibility & Compliance

The DM750 accommodates standard 1 mm–1.2 mm thick glass slides and 22 × 22 mm coverslips. Its modular condenser supports brightfield, phase contrast (via optional 4-position phase slider), and darkfield observation using Leica-certified accessories. The system complies with IEC 61000-6-3 (EMC emission) and IEC 61000-6-2 (immunity) standards. All electrical components meet UL/EN 61010-1 safety requirements for laboratory equipment. While not FDA-cleared as a medical device, the DM750 satisfies essential performance criteria outlined in CLSI EP12-A2 for qualitative microscopy in clinical cytology workflows and aligns with ISO/IEC 17025 documentation expectations for instrument verification in GLP environments.

Software & Data Management

The DM750 operates as a standalone optical platform with no embedded digital imaging hardware. However, it is fully compatible with Leica ICC50 HD and DMC series cameras via C-mount adapter (optional). When paired with Leica Application Suite (LAS) X software (v3.7+), users gain access to audit-trail-enabled image capture, annotation, measurement tools (calibrated per ISO 10993-12), and export functionality compliant with FDA 21 CFR Part 11 when deployed with validated IT infrastructure. Camera integration preserves native resolution up to 5 megapixels and supports time-lapse acquisition with hardware-triggered synchronization.

Applications

• Routine histopathology screening and hematology smear evaluation in clinical laboratories
• Undergraduate and graduate-level life science instruction—including cell biology, microbiology, and plant anatomy labs
• Quality control inspection of cultured cells in biomanufacturing cleanrooms (ISO Class 5–7)
• Basic morphological analysis of fixed and live unstained specimens (e.g., protozoa, algae, yeast) using phase contrast optics
• Forensic fiber and trace evidence examination under standardized brightfield illumination protocols

FAQ

Is the DM750 suitable for fluorescence microscopy?
No—the DM750 lacks a fluorescence excitation light path, filter cube turret, or dichroic mirror assembly. For fluorescence applications, consider the Leica DMi1 or DM4 B platforms.
Can third-party objectives be used with the DM750?
Only Leica-certified objectives are guaranteed to maintain HCS calibration and mechanical compatibility. Non-OEM lenses may compromise parfocality, working distance alignment, and brightness synchronization.
Does the DM750 include a built-in camera port?
Yes—a standardized 23.2 mm C-mount adapter is integrated into the trinocular head; no additional mechanical modification is required for camera attachment.
What maintenance is required for the LED illumination system?
None beyond periodic cleaning of the collector lens and condenser top lens with lens-grade tissue and reagent-grade ethanol; the LED driver contains no consumable parts and requires no recalibration over its rated service life.
Is the AgTreat™ coating effective against viruses?
AgTreat™ is validated for antibacterial activity (Staphylococcus aureus, Escherichia coli) per ISO 22196. It has not been tested against enveloped or non-enveloped viruses; therefore, no antiviral claims are supported.