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Upright Microscopes for Polarization Leica DM4 P, DM2700 P & DM750 P

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If you would like to investigate crystalline structures, polarization microscopy will serve you best. Whether it be minerals, plastics and polymers, drugs and pharmaceuticals, or pigments and cement, with our polarization microscopes you will see what interests you most as a researcher or in quality assurance.

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Crystal Clear

Upright Microscopes
for Polarization
Leica DM4 P, DM2700 P & DM750 P

Depending on your application, you can choose from three different systems for polarization microscopy:

● The fully coded and semi-automated Leica DM4 P

● The manual Leica DM2700 P

● The Leica DM750 P educational microscope

Learn more about polarization microscopy on Science Lab.

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Get Optimal Results

You need a few components to get what you aim for in polarization. These are the most important:

● Strain-free optics, because you need to be sure that the observed birefringence

results from the sample and not from the optics

● LED illumination is crucial, because it lights the samples homogenously and at a

constant color temperature

● Polarizers will make birefringence visible and a rotatable stage enables you to

align the sample and optical axis

● You need a Bertrand lens for conoscopic observation of the optical axis

and compensators for measurement tasks

Get to know step by step in this polarization tutorial.

There will be Light!

LED illumination saves you money in many ways: It consumes less energy than halogen illumination, and does not need to be replaced, causing downtime of your instrument, because it has a lifetime of up to 25,000 hours. Further advantages:

● LED lights your samples homogeneously and at a constant color temperature,

providing you with a realistic impression of your sample

● LED adjusts light intensity fast so you can work smoothly

● LED requires no daylight filter since the LED already provides constant light

temperature of 4500 K

● LED produces little heat, and therefore does not need a cooling fan

● LED lets you work undisturbed, because no cooling fan makes a noise around you

Completely at Your Service: Leica DM4 P

If you want to do everything in polarization microscopy, you can with the Leica DM4 P.

Store and recall information with coded components

● When you change objectives, illumination intensity and aperture settings are recalled with the Illumination Intensity Control and Contrast Manager.

● Acquired images are always calibrated due to the coded nosepiece.

Identify interesting structures

● With the large 25-mm field of view you get a perfect overview.

● A lower magnification rather than the detailed view often reveals the specific information

you need - just think of flow or deformation structures or zonation by cooling processes.

Get your Nosepiece Around it!

Get different sample information from different magnifications of the 6-objective nosepiece.

● Use a 2.5x overview objective to identify macro structures in your sample.

● Change to 63x magnification for detailed investigations of optical properties by

means of conoscopy

● Switch to 100x to inspect phase reactions along grain boundaries

By the way: The nosepiece is also coded, so that it supports you intelligently.

Best of Both Illuminations

You can configure the Leica DM4 P with LED illumination either for transmitted light or incident light or with LED for both transmitted light an incident light in one go.

● Incident light is mandatory for all who perform reflectivity measurements,

for example looking at ores or coal.

● Transmitted light is required for birefringence measurements, for example in inspection

of geological thin sections, polymer foils, or drugs.

● For specific applications such as in geological research, both are necessary.

When the microscope is equipped for both incident and transmitted light, the associated objective, that is with or without cover glass correction, should be used from magnification >10x.

Investigate Optical Properties

Conoscopy is used to investigate interference figures. Their shape and the modifcation achieved by compensators yields information about the optical properties of the investigated material. You can determine the number of optical axis, the angle(s) of optical axis and the optical character of the material.

The Leica DM4 P is ideally suited to conoscopy:

● Strain-free objectives with high magnification and high numerical aperture are a must for this application.

● Use special 63x Leica objectives that fulfill the highest requirements of polarization class 5 to obtain optimal results.

Conoscopic image of Brookit, TiO2, with strong dispersion colors
Uni-axial interference figure of thick calcite plate, perpendicular to optical axis
Bi-axial interference figure of thin biotite crystal in diagonal position at circular polarized light. Position of optical axis can be clearly identified

Great Flexibility: Leica DM2700 P

If you do not need full automation and maximum reproducibility, the Leica DM2700 P is your instrument of choice. Apart from the automation, it offers a flexibility which is similar to the Leica DM4 P.

● Get distinct sample information with 5 objectives on the 5-fold

centerable objective revolver

● Get large overviews from the 22-mm field of view

● Obtain a better contrast with UC-3D illumination at incident

light observation

The Champion in Education: Leica DM750 P

In education you need a robust tool that students can use every day. You can easily plug and play it – that’s what we call best preconditions for successful learning.

● Get into the details of your samples with 4 objectives

● Use the 20-mm field of view for a good overview

● Enjoy the practical details the instrument offers: You can carry it by

its handle and stow away its cable inside the instrument

	Leica DM4 P	Leica DM2700 P	Leica DM750 P
Size and weight	Dependent on configuration at aproximately 25 kg. Length: 460 mm (w/o lamphousing), width: 333 mm, height: 480 mm (depending on tube and configuration)	Dependent on configuration at aproximately 18 kg. Length: 410 mm (with lamphousing), width: 331 mm, height: 505 mm (depending on tube and configuration)	With A/B module = 456 mm height, 220 mm width, 396 mm depth, weight 12 kg
Nosepiece	6x (M25), centerable, encoded	5x (M25), centerable	4x (M25), centerable
Eypieces, usable field of view (FOV)	25 / 22 / 20 mm FOV	22 / 20 mm FOV	20 mm FOV
Illumination incident and transmitted	High-power LED	High-power LED	High-power LED
	Optional: Halogen 12V / 100W External light source for fluorescence excitation Leica EL6000 Hg lamphouses (mercury)	Optional: Halogen 12V / 100W External light source for fluorescence excitation Leica EL6000 Hg lamphouses (mercury)
Incident light axis	Motorized, 4-fold turret, illumination and contrast manager	Manual, 4-fold turret, color-coded diaphragm assistant (CDA)	Manual, fixed brightfield beamsplitter
Incident light	Polarization contrast Brightfield DIC Fluorescence	Polarization contrast Brightfield DIC Fluorescence UC-3D illumination	Polarization contrast Brightfield Oblique illumination
Transmitted light axis	Motorized condensor operation, illumination and contrast managment	Manual condenser operation with color-coded diaphragm assistant (CDA)	Manual condenser operation with color-coded diaphragm assistant (CDA)
Transmitted light	Polarization contrast Orthoscopy Conoscopy Brightfield Phase contrast DIC Darkfield	Polarization contrast Orthoscopy Conoscopy Brightfield Phase contrast DIC Darkfield	Polarization contrast Orthoscopy Conoscopy Brightfield Phase contrast Darkfield
Stage	360° rotatable polarization stage with verniers and brake 360° rotatable polarization stage with verniers, 45° clickstop position, and brake Stage carrier for adaptation of 3rd party stages Scanning stage 100x100 Scanning stage 75x50 Manual xy stages	360° rotatable polarization stage with verniers and brake 360° rotatable polarization stage with verniers, 45° clickstop position and brake Stage carrier for adaptation of 3rd party stages Scanning stage 75x50 Manual xy stages	Fixed 360° rotatable polarization stage with verniers and brake
Focus drive	25-mm stage stroke of coarse and fine drive 45-50-mm total stage stroke depending on stage and condenser type Fine drive: 0.2 mm per turn of the knob (1 scale interval = 2 mm) Coarse drive: 3.5 mm per turn of the knob Motorization on request	25-mm stage stroke xx-xx mm total stage stroke depending on stage and condenser type 2-gear focus drive (coarse / fine) with 1mm scale 3-gear focus drive (coarse / medium / fine) with 1 and 4 mm scale, torque adjustment, and adjustable upper focus stop Motorization on request	17-mm stage stroke
Conoscopy	Fully integrated coded conoscopy module, additional 1.6x magnification changer, user guidance by display feedback Advanced conoscopy module (manual)	Bertrand lens cube Bertrand lens module (A/B module) Advanced conoscopy module (manual)	Bertrand lens module (AB module) A/B module with focusable Bertrand lens
Analyzer	Fixed analyzer 180° rotatable analyzer 360° rotatable analyzer
Polarizer	360° polarizer for incidend light 360° polarizer for transmitted light Fixed polarizer with lambda plate Fixed polarizer with 0°, 45° and 90° positions 90° polarizer with rotatable lambda plate Polarizer in holder for transmitted light
Compensatores	l, l/4, quartz plate (0.-4. Order), tilting compensatores