Ira wrote:
The conversation was about the quality and properties of a lens, nothing to do with art or the critique of a photograph. There are many "Professional Photographers" who have never studied art and have no understanding of composition, color theory, or design, but they call themselves Pros. This has nothing to do with Pros and Amateurs. A real artist doesn't have to delineate between a pro and amateur, his work will speak for itself.
By definition, most pros are amateurs. The difference is in how one generates income. If a person's primary source of income is generated by the creation of still photographs and or motion pictures or videos with a camera, they are professional photographers.