There are numerous definitions on the web, but in the context of cameras I personally would describe it as:
"A camera whose design is reminiscent of early 20th century industrial machinery, featuring sculptured knobs, dials, levers, struts, and optical housings, with a total absence of any electric or electronic components.".
I would offer the somewhat later-period cameras, such as the 1950's Exaktas and the Kodak Medalist as an example. I would add the Barnack Leicas as well.
It's a nickname for an aesthetic that was in vogue a few years ago (and still lingers) that took elements of industrial revolution-era machines, science fiction, Victorian or Edwardian clothing and, to a lesser degree, punk rock and applied them to art and fashion.
Think of Jules Verne for the 21st Century and you've got an idea of what's going on.
Enter "steampunk" into Google images for an onslaught of steampunk regalia.
It's a nickname for an aesthetic that was in vogue a few years ago (and still lingers) that took elements of industrial revolution-era machines, science fiction, Victorian or Edwardian clothing and, to a lesser degree, punk rock and applied them to art and fashion.
Think of Jules Verne for the 21st Century and you've got an idea of what's going on.
Enter "steampunk" into Google images for an onslaught of steampunk regalia.