Hi there,
Good to hear you've caught the bug. Your story about the trip to the Andes was lovely, although it made me wonder. Did your brother like it, because he saw a kind of journalistic photo-essay in your work? Was it the aesthetics of the imaging, or was it something about the cultural information which it conveyed? Possibly a combination of the lot?
If so, then a 35mm SLR would be more than fine, if you honed your film selection choice.
Try
www.silverprint.co.uk and
www.retrophotographic.com
If that's London, England you're referring to, and not London, Bosnia-Herzinagovia. If you're using fine grained ISO 100 film like Fuji Acros or Ilford Delta, then you won't have a problem getting decent 30" enlargements provided everything else causing camera wobble is sorted out. You can get film down to ISO 25 in England Actually, that's not true. I've just looked and they do film down to ISO 1!! Wow. Digital - eat finger dip from 35mm quality at grainless ISO 1 film!
Actually don't get carried away - I suspect that wouldn't be much use for anything moving apart from copying documents.
"I'd really love to do something commercial with my photography, but it seems that I can't unless I invest in a medium format camera and start carrying that around, together with a tripod. That's getting a bit serious for a holiday"
I'm tempted to say all things are relative. I carry a large format camera, a studio tripod with a ball head, all in the ball-park weight of around 20 kg with me. A medium format camera can be surprisingly light. Have you looked at the Bronica RF645? The Mamiya 7II? The discontinued Fuji GSW690III? The < insert your favourite portable medium format camera here > will be very manageable with a lightweight monopod, or even folding tripod. If you got a rangefinder type, you may not need M.L.U. (Mirror lock up). Only reflex type cameras (single lens reflex types) require this, because the mirror swing causes vibrations. One medium format manufacturer, Hasselblad, bypass this problem by introducing a "gliding mirror" which makes it relatively easier to hand-hold a medium format camera at 1/30sec. The M.L.U. increases that safety margin.
" so if I was to do something commercial, then I feel that I would have to make the decision to become a photographer as a profession, a step that I'm not sure I'm prepared to take."
I don't personally hold that belief, but others do. Being a good artist doesn't mean you have to have it as your profession. Some of my colleagues who aren't professional photographers earn my respect because their love for their imaging and work shows itself so much more, because they can afford to: they don't have to rely on selling their work in order to put a loaf of Hovis on the table, or send the kids to private school. A lot of non-professional photographers produce distinctive and personal work. In fact, most professional photographers are probably tired of seeing their own commercial work day in day out, preferring their own personal work. Don't give up just yet.
"It's a pity when you feel you're getting really good shots and would like to do more with them, but can't. "
Why not create your own website? Upload them for others to see? Write a photoblog with it? It doesn't have to spin off $1000 today. If it is rewarding for you to do, then it's a step in the right direction. I might add that being taken in by a gallery isn't a guarantee of anything. No modern photographer in England can afford to live off his earnings from gallery sales alone (the Weston/Strand exhibition proves the point - he's dead already, decades over). You don't have to be at the pinnacle of your photographic career today - next year, or 5 is more than fine. Look at Simon Norfolk - how long has the guy been banging away quietly, being ignored until 3 years ago?
I wonder if you might be able to concentrate your learning on the more technical aspects of photography: refine those; learn about optimising your images. That way, in a few years time, your artistic expression will be much clearer, and better able to represent your vision in the images. Hmm?
Oh. And definitely consider medium format. It's not as inconvenient as you think.