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Stereo Microscope

Definition

A low-magnification microscope producing stereoscopic depth perception by presenting each eye with a slightly different viewing angle (convergence angle 10-15 degrees). Uses a real, erect, laterally unreversed image. Not for histology or sub-micrometre resolution.

Image type
Real, erect, laterally unreversed
Convergence angle
10-15 degrees
Magnification range
Low, not suited to histology or sub-micrometre detail
Depth perception
True stereoscopic, each eye a different angle

Common questions

Why is a stereo microscope preferred over a compound microscope for handling small trace evidence?+

Its low magnification with a large working distance and true depth perception lets an examiner manipulate a fibre, hair, or particle with tools while looking at it, something a compound microscope's flat, high-magnification, short-working-distance view does not support.

What is the practical limit of a stereo microscope compared to a compound or comparison microscope?+

Its magnification ceiling is far below what is needed to resolve fine internal cell structure or sub-micrometre features, so it is used for gross surface examination and specimen preparation rather than histological or high-resolution comparison work.

Related terms

AFTE Theory of Identification
The Association of Firearm and Tool Mark Examiners' standard (1992, revised 2011) for reporting tool-mark comparison conclusions as Identification, Inconclusive, or Elimination...
Class Characteristics
Features deliberately or systematically imparted to a group of items by design or manufacture, such as the calibre of a bullet, the...
CMO Design
Common Main Objective stereo microscope design using a single large objective with two off-axis optical channels passing through it. Allows better working...
Comparison Microscope
Two compound microscope bodies connected by an optical bridge that presents one half of each body's image in a single split eyepiece...
Congruent Matching Cells (CMC)
An objective, measurement-based metric for cartridge-case comparison developed at NIST, quantifying the fraction of surface topography cells showing high correlation between questioned...
Greenough Design
A stereo microscope in which two completely independent objective lenses, tilted at the convergence angle, each with its own optical axis, form...
Individual Characteristics
Surface features on a fired bullet or cartridge case that arise from random or unique events (tool wear, corrosion, service damage) and...
Medullary Index
The ratio of the medulla diameter to the total hair shaft diameter. In companion animal hair identification, a medullary index above 0.5...
Optical Bridge
The beam-splitter and prism assembly that couples the two microscope bodies of a comparison microscope and produces the split-field composite image in...
Parfocal Stage
A microscope stage on which the specimen remains approximately in focus when switching between objectives, enabling rapid survey across magnification ranges without...
PCAST 2016
President's Council of Advisors on Science and Technology 2016 report 'Forensic Science in Criminal Courts', which assessed foundational validity of forensic disciplines...

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