As a marketing term, in the DSLR era the "pro" camera body was used to signify the big cameras with tough, weather-sealed bodies, built-in vertical grips and enormous batteries that were marketed to working photojournalists.
At the other end were consumer grade cameras that put more emphasis on affordability and ease of use than ruggedness, a full feature set, and cutting edge specifications.
In between these two...but closer to the former than the latter...are those "prosumer" bodies I was talking about the other day.
What are their defining features? If I had to make a list...
- Dual control wheels, so that in Manual mode you have one for aperture and one for shutter speed.
- Dual card slots (although not always)
- An LCD readout on the top panel (although not always)
- Rugged, usually metal, body
- Weather sealing
- A pentaprism, rather than pentamirror, viewfinder
What they don't have is a built-in grip, and they usually lack the latest and greatest technology that the pro bodies have. Historically they had more cost-conscious crop sensors.
Canon's 7D is practically the type specimen.
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