Compound Optical Microscope

A compound optical microscope uses two lens systems in series, an objective near the specimen and an eyepiece, to reach magnifications a single lens cannot. The form settled in the nineteenth century and had barely changed by the 1980s: a heavy cast base, an arm, a stage with clips, a rotating turret of objectives and coarse and fine focus knobs. It is one of the most stable industrial designs in existence, which matters here, because it means the toy could be a convincing microscope without imitating any particular manufacturer.

Perceptor is the Autobots' scientist, introduced in 1985, written as precise, verbose and slightly detached. Where Wheeljack is the inventor who blows things up, Perceptor is the researcher who measures things. A microscope is not a disguise in any meaningful sense, and the fiction barely pretends otherwise, but as a statement of function it is unimprovable.

The toy has three modes: microscope, a wheeled scope-carrying vehicle, and robot. Crucially the optics are real. The eyepiece contains an actual lens assembly and the toy magnifies, which for a 1985 mass-market action figure was a genuine feature rather than a claim. The Microchange original was released in a black deco; Hasbro's recolour into red, blue and silver is what made him look like an Autobot rather than a laboratory instrument.

Not Diaclone. Takara Microman 'Microchange' Micro Scope Robo, 1983, released in a predominantly black deco (commonly catalogued as MC-20, occasionally as MC-04). Perceptor is the red, blue and silver recolour of it.

Fan lore about these vehicles is unusually unreliable. Where a popular claim does not survive checking, it is recorded here rather than repeated.

• The Microchange catalogue number is cited as both MC-20 and MC-04 in different collector sources.