Laboratory microscopy: how can a reliable image of the sample be obtained?

At the heart of life sciences, quality control and materials science, microscopy turns the invisible into actionable evidence. From rapid inspection to counting, from fluorescence to documentation, image quality depends on a coherent set-up: microscope, light source, objectives, camera, as well as sample preparation and optics maintenance. Our selection spans the full spectrum, from the stereomicroscope (dissecting microscope) to the imaging workstation, with robust, compatible and future-proof solutions for reproducible, traceable results.

Which microscopy equipment and consumables should you choose?

Choose an upright or inverted microscope according to the specimen: slides, cell cultures or particles. The contrast modes (brightfield, phase contrast, DIC, fluorescence) guide the choice of objectives and filter sets. The stereo microscope/dissecting microscope offers a large working distance and depth of field for dissection, sorting or visual inspection.

The microscope camera converts the image into data.

The light source sets the stability of illumination: LED (long lifespan, efficient, instant-on), halogen (continuous spectrum), metal-halide/mercury for certain excitations — prefer mercury-free alternatives wherever possible. The immersion oil (n?1.515) optimises the resolution of 100× objectives; apply sparingly and remove after use. Microscopy reagents (stains, anti-fade mounting media) stabilise and reveal structures. The optical cleaner and dedicated lens tissue protect lenses and eyepieces; avoid harsh solvents.

Selection criteria: resolution/NA, ergonomics, mechanical compatibility (C-mount, parfocality), constant illumination (Köhler), energy efficiency and availability of consumables.

Type	Principle	Applications
Compound microscope	High-magnification objectives, transmitted illumination	Slides, histology, cells, bacteriology
Stereomicroscope	Two optical paths, low magnification	Dissection, sorting, component inspection
Microscope camera	CMOS sensor, C-mount/USB interface	Acquisition, measurement, traceability

Which fields use microscopy?

• Life sciences: cell culture (counting, viability), histology (H&E, IHC), immunofluorescence, parasitology.
• Pharma & cosmetics: particulate control, content/formulation uniformity, packaging and surface inspection.
• Food industry: hygiene, foreign bodies, microstructure (starch, dairy), process monitoring.
• Environment: identification of plankton/diatoms, microplastics, sediments.
• Chemistry & materials: polymers, fibres, reflected-light metallography, surface defects.
• Education & R&D: teaching, documenting experiments, SOP drafting, audits.
• Quality & metrology: image traceability, calibrations (micrometres), regulatory compliance.

The different microscopy product ranges available

Laboratory microscopy: frequently asked questions

How to choose between a stereomicroscope and a compound microscope?
The stereo scope offers generous depth of field for manipulation and inspection.

CMOS or CCD for the camera?
Modern CMOS deliver low noise, high frame rates and wide dynamic range. CCDs are only useful for very specific needs. Check software support, mount and sensor size.

Which immersion oil to use, and when?
Use oil with n?1.515 designed for oil-immersion objectives (typically 100×). Never apply oil to a “dry” objective. Clean the front lens and slide after each session.

LED or halogen for illumination?
LED is stable, energy-efficient and long-lasting. Halogen provides a continuous spectrum that helps in brightfield. For fluorescence, favour LED or mercury-free metal-halide where possible.

How to clean optics safely?
Start with a blower, then lens tissue with an appropriate solution (diluted isopropyl alcohol). Use gentle circular motions. Avoid acetone and lint-shedding cloths.

Pixel size and NA: what’s the impact on resolution?
The pixel should sample the detail produced by the objective finely enough (Nyquist criterion). For example, with a 100×, a ~6.5 µm pixel at the sensor is often suitable.

Precautions in fluorescence?
Protect yourself from UV/blue (shields, safety glasses). Minimise exposure to limit photobleaching. Dispose of mercury lamps in line with regulations.