Sample-side parameters decide whether a microscope substitution works: working distance, cover-glass correction, illumination path and stage envelope.
Replacing an eyepiece-less inspection microscope is not an optics-only decision. Six published parameters covering eye point, parallax, sampling and interface.
A measuring microscope is an instrument, not a magnifier. Six published parameters that decide whether a substitute measurement chain holds its stated numbers.
Magnification is not the number that decides a microscope substitution. Six published parameters to verify before a Zeiss industrial microscope leaves a line.
Compact high-pixel C-mount swaps turn on temperature range, optical versus mechanical back focal length, per-format distortion, and what is unpublished.
Mechanics limit large-format swaps before optics do: image circle, per-format distortion, long back focal length, three filter threads in one POMEAS series.
Wide coverage does not survive a swap: check image circle, per-format distortion, the 1 m to infinity focus range, and mount. Values from five POMEAS lenses.
Four numbers decide whether a substitute lens works on a running station, and none is in the service record: image circle, back focus, distortion, focus floor.
Replacing a C-mount FA lens means matching image circle, back focal length and filter thread, not just focal length. Six checks with published POMEAS FA values.
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