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FusionOptics optical technology reveals even the smallest details

Fully Automated Stereo Microscopy with a Difference Leica M205 A

The fully automated Leica M205 A stereo microscope allows you to do a wide variety of repetitive tasks precisely and reliably with just a few time-saving mouse clicks.

Like all stereo microscopes of the Leica M205 class, the M205 A integrates revolutionary FusionOptics optical technology. This optical concept produces images with superb resolution and maximum depth of field, resulting in perfect 3D representations of your specimens.

Incorporating this patented optical concept, the Leica M205 A is the world’s first automated stereo microscope with 20.5:1 zoom to attain an optical resolution of 0.952 µm.

Leica M205 A Stereo Microscope

Your Advantages

Motorized functions free both hands to work on the sample Optical opposites reconciled –  FusionOptics optical technology

Motorized functions free both hands to work on the sample

Do you need one or both hands to work on the specimen? If so, the motorized Leica M205 A is just right! All the functions of this high-performance stereo microscope can be operated via the user-friendly SmartTouch control unit or the Leica Application Suite (LAS) software supplied with the microscope.

Optical opposites reconciled – FusionOptics optical technology

What does “FusionOptics optical technology” mean? The right channel delivers an image with the highest possible resolution; the left channel provides an image with maximum depth of field. The human brain does the rest: Drawing the best information from both images, it creates a three-dimensional image, visualizing the finest details of your specimen. Further information is available in Science Lab: http://www.leica-microsystems.com/science-lab/fusionoptics-combines-high-resolution-and-depth-of-field-for-ideal-3d-optical-images/ 

Apochromatic 20.5:1 zoom with standard magnification of 7.8x to 160x High-performance optics: numerical aperture of 0.35

Apochromatic 20.5:1 zoom with standard magnification of 7.8x to 160x

Due to the large zoom and magnification range of the Leica M205 A you can perform a wide variety of tasks without changing the objective or even switching microscopes. Our most popular objective, the 1.0x PlanApo, for instance, images an object field of max. 29.5 mm diameter at 7.8x magnification. At 160x magnification, details as small as 1.9 µm can be visualized with a maximum NA of 0.175.

High-performance optics: numerical aperture of 0.35

The 2.0x PlanApo objective is an optical masterpiece. It has a maximum aperture of 0.35 – that’s the highest numerical aperture (NA) that has ever been achieved with a stereo microscope worldwide. Based on the optical laws of Ernst Abbe, the Leica M205 A attains an optical resolution of 1050 LP/mm (line pairs per millimeter) or 0.952 µm. That means you can see details that are smaller than a hundredth of the diameter of a human hair.

No chromatic aberrations Reproduction and documentation with a single keystroke

No chromatic aberrations

The Leica M205 A has full apochromatic correction, i.e., the lateral chromatic aberration of the three colors; red, blue, and green; has been corrected so that they are reproduced faithfully and with rich contrast at the transitions between light and dark structures.

Reproduction and documentation with a single keystroke

Leica Application Suite (LAS) software lightens your workload by enabling you to control both the magnification setting and the position of the iris diaphragm in real time in the software. These settings are saved together with each image and can be recalled at a keystroke. What more efficient way to reproduce and document your results? 

Powerful range of illuminators Modularity

Powerful range of illuminators

From homogeneous illumination with a ring light to highly diffused dome illumination for strongly reflective samples – with the Leica M205 A you always present your specimens in the best light. You can use all the incident light sources in the Leica LED5000 series and the transmitted light bases of the Leica TL3000-5000 series. Information on our unique range of illuminators is provided at http://www.leica-microsystems.com/products/stereo-microscopes-macroscopes/illumination/.


You need investment security? And have to meet different requirements? You are making a wise investment with the Leica M205 A. Choose from a wide range of accessories to customize the system to your specific needs. Leica Microsystems’ M series is designed to cater to changing requirements, too.