he is what most of us at Luminous-Landscape are an enthusiast. Notice I don't like the word amateur.
Only because I am a frustrated etymologist that has no friends.

It is interesting that you prefer the term "enthusiast" which means "a person who is filled with enthusiasm for some principle, pursuit, etc." over
"amateur" which means "a person who engages in a study, sport, or other activity for pleasure rather than for financial benefit or professional reasons. "
Both definitions from Dictionary.reference.com and are the first (primary or most common) definitions of the specific term.
An enthusiast does not have to do anything. I can be an enthusiast about photography and never take a picture. Whereas an amateur is someone who actually participates. If I am an amateur photographer I have to take photographs.
I know that some people use amateur as a derogatory term. But it really shouldn't be.
Especially in the field of photography where we have amateurs with more experience and more talent than professionals have in some cases.
Yeah, only a friendless disgruntled etymologist would care. LoL