A microscope is chosen by the working distance and the magnification the sample needs, and the rest follows: a compound instrument for thin specimens at high magnification, a stereo instrument for manipulation, and a specialist stand where the sample is metal, a wafer or a tool. Cameras are a separate decision with their own specifications.
A cytology microscope and what the work demands
A cytology microscope is a compound instrument specified for long sessions and consistent colour: comfortable ergonomics, a stable colour temperature illuminator and a plan objective set that keeps the field flat. What separates it from a teaching instrument is documentation and repeatability rather than optics, since a diagnostic reading has to be defensible.
An electronics microscope for board level work
What a catalogue calls an electronics microscope is a stereo or digital inspection instrument with a long working distance and strong oblique illumination, because the sample is a board being worked on rather than a slide. Depth of field matters more than resolution, and a boom stand with a camera is the usual arrangement rather than a transmitted light base.
A 100x microscope objective and what it needs
A 100x microscope objective is an immersion lens, so it needs oil, a coverslip and a condenser aperture set correctly, and without those it delivers a dimmer and worse image than a 40x dry lens. Empty magnification beyond the numerical aperture's limit adds nothing, which is why a good 40x often beats a poor 100x.
A metal microscope and reflected light
A metal microscope is a metallurgical instrument using reflected rather than transmitted light, because the sample is opaque, and it is specified by the illumination modes it carries: bright field, dark field, polarised and differential interference. Sample preparation, mounting, grinding, polishing and etching, decides the image far more than the optics do.
A compact microscope and the trade it makes
A compact microscope saves bench space and usually gives up the objective range, the condenser control and the camera port, which is what limits it to teaching and quick checks. The specification worth reading is whether the objectives and the head can be changed later, since a sealed instrument cannot follow the work as it changes.
A toolmaker microscope and measurement rather than imaging
A toolmaker microscope is a measuring instrument: a stage with micrometer movement, a reticle and a long working distance, used to measure a feature rather than to look at it. Its specification is measurement uncertainty rather than resolution, and its calibration with traceable artefacts is what makes a dimension it reports usable in a report.
A high speed microscope camera and what the frame rate costs
A high speed microscope camera trades sensitivity and field of view for frame rate, because each frame collects less light, so a fast recording usually needs brighter illumination and accepts more noise. Interface bandwidth and on camera memory decide how long a burst can last, and for live cells the illumination rather than the camera is what limits the experiment.
microscope camera software and the record it keeps
microscope camera software matters for the metadata as much as the image: exposure, gain, objective, illumination and scale bar have to travel with the file, or a quantitative comparison cannot be defended later. Open file formats and the ability to export raw data rather than a rendered picture are what make an image reusable.
Questions people ask about binocular compound microscope
Compound or stereo?
Compound for thin specimens at high magnification, stereo for working distance and manipulation.
Is 100x always better than 40x?
No. Without oil, a coverslip and correct condenser settings a 100x objective is worse. Resolution is set by numerical aperture.
What has to be saved with an image?
Exposure, gain, objective, illumination and the scale calibration, in a format that can be read years later.