Inverted Microscopy: How It Works and When to Use It

Short answer

Inverted microscopy uses a microscope whose objectives and objective turret sit below the stage, so the specimen is viewed from underneath. That layout lets you place Petri dishes, culture flasks and multi-well plates directly on the stage and look at living cells in their own vessel. Because the light reaches the objective through the vessel bottom, the thickness and material of that bottom become part of the optics.

Definition and scope

An inverted microscope is a light microscope built upside down relative to the familiar upright design. Leica Microsystems describes it in its DMi1 FAQ in two plain statements: the optics are located below the stage, and inverted microscopes are designed with the objectives and turret positioned below the stage. In practice that means the specimen rests on top of the stage and the objective looks up at it.

This page covers the inverted light-microscope stand and what it means for the vessels placed on it. It does not cover electron microscopy, for which see the cryo-EM microscope entry, and it does not give operating or alignment procedures; those are in the linked guides below.

How inverted microscopy is used in practice

The vendor FAQ gives the everyday use directly: you can place Petri dishes or cell culture flasks on the stage and monitor the specimen. Its example of a routine check is to determine the confluence of cells before they are transfected with gene constructs. For background on the culture work itself, see the cell culture basics guide.

Two practical points follow from the geometry.

• The coverslip faces down. The UCSD Nikon Imaging Center’s coverslip guide states that on its inverted microscopes the coverslip faces down, toward the objective.
• Large vessels need clearance. For large flasks the Leica FAQ recommends its S80 condenser, which has an 80 mm free working distance, and it lists a maximum sample weight of 30 kg depending on the stage used. Both figures are specific to the Leica DMi1; other stands will differ.

Illumination still has to be set up correctly on an inverted stand. The Kohler illumination alignment guide includes a section on upright versus inverted stands, and the phase contrast alignment guide covers that contrast method separately.

Types and related concepts

Inverted confocal microscopy

Confocal imaging on an inverted stand follows the same vessel and coverslip rules described above, because the specimen is still viewed through the bottom of its container. The University of Houston BBIC guide to efficient confocal imaging, written for its Leica SP8 and Olympus FV3000 systems, tells users to use 1.5 coverslips (roughly 0.17 mm thick) and notes that 1.5H coverslips are even better because they vary less in thickness. It adds that none of the SP8 objectives are adjustable for different coverslip thicknesses, and that live-cell imaging should use dishes with a 1.5 glass bottom.

Where it matters for labs: vessel bottoms and the optical path

With an upright microscope the coverslip sits on top of the specimen. On an inverted stand the vessel bottom plays that role. The UCSD guide stresses that coverglass thickness is extremely important for high-NA oil-immersion objectives. The table below collects what the two facility guides state about common vessel and coverglass choices; every row comes from the source named in it.

Vessel or glass	What the named facility states	Source
#1.5 coverglass	About 170 µm thick; high-quality glass has a tolerance of ± 5 µm.	UCSD Nikon Imaging Center
#0 and #1 coverglass (100 µm and 150 µm)	Should be used only when extra working distance is absolutely essential.	UCSD Nikon Imaging Center
Dishes, chambers, multi-well plates	Preferably a glass bottom with #1.5 thickness.	UCSD Nikon Imaging Center
Differential interference contrast (DIC)	Use a glass bottom and a glass lid, because plastics can distort polarized light.	UCSD Nikon Imaging Center
Live-cell dishes on the Houston confocal systems	Dishes with a 1.5 glass bottom.	University of Houston BBIC
Plastic vessels with one named objective	The UCPLFLN20X objective can image through plastic vessels, provided the plastic is not thicker than 1 mm.	University of Houston BBIC

Read together, the sources give a simple checklist for anyone specifying vessels for an inverted stand: confirm the bottom material and thickness, confirm that the objective you intend to use can image through it, and ask whether the specimen will be within the working distance of the objectives you wish to use, the question the Houston guide poses to its users. Supply decisions for dishes and plates follow from those answers rather than from the microscope alone.

Common misunderstandings

• “Inverted” does not mean a different kind of image. It describes where the objectives sit relative to the stage. Contrast methods and illumination alignment are separate choices, covered in the guides linked above.
• Any dish will do. The facility guides above state that glass bottoms of #1.5 thickness are preferred, and that plastics can distort polarized light in DIC.
• Thickness labels are interchangeable. A #1.5 coverslip is about 170 µm with a stated tolerance of ± 5 µm, whereas #0 and #1 are thinner (100 µm and 150 µm) and reserved for cases where working distance is essential.
• Specifications are universal. The 80 mm working distance and 30 kg limit quoted from Leica belong to the DMi1 and its stages, not to inverted microscopes in general.

FAQ

What is inverted microscopy?

It is light microscopy on a stand whose objectives and turret are below the stage, so the specimen is viewed from underneath, typically in a dish or flask placed on the stage.

What is inverted confocal microscopy?

It is confocal imaging on an inverted stand. The vessel rules are the same as for other inverted work: the facility guides cited here call for glass-bottom dishes or #1.5 coverslips for confocal imaging, with the coverslip facing down on an inverted system.

Why do inverted microscopes suit cell culture?

Cells can be monitored in their own Petri dish or flask placed on the stage, for example to determine confluence before transfection.

Does vessel thickness matter?

Yes. The UCSD guide calls coverglass thickness extremely important for high-NA oil-immersion objectives, and it describes #1.5 glass (about 170 µm, ± 5 µm) as the thickness to prefer for dishes and plates.

Sources

• Leica Microsystems, Leica DMi1 FAQ: leica-microsystems.com/products/light-microscopes/p/leica-dmi1/faq/ (checked 2026-10-29).
• UCSD Nikon Imaging Center, coverslip guide: nic.ucsd.edu/guides/coverslips.html (checked 2026-10-29).
• University of Houston Biomedical Bioimaging Core, efficient confocal imaging: bbic.nsm.uh.edu/protocols/efficient-confocal-imaging (checked 2026-10-29).