To me, neither the equipment nor the film define "serious" photography; rather it is the intent of the photographer and the images produced.
In 2006 I was in Yosemite and had my SX-70 with me. I made a photo of El Capitan and of Half Dome that impressed me with the creaminess and tone of the colors - right then I knew I had two keepers (which I later scanned and enlarged to 8x10). These two are among my very favorite photos that I've made over the last 30 years with various formats and media. I suppose if I'd used 35mm, or whatever - even digital, I might be able to tweak the results to look similar -- but I knew the shots had an amazing look right after I took them.
Ratty - did you ever snag an instant camera? I got my oldest a 250 land camera for his birthday and loved his shots so much I found a 360 for myself but am having some issues with it.
Polaroid Polagraph 400. Miss it terribly.
Marie Consindas and Andy Warhol has been doing serious work. When I shot professionally back in the day, I only use Polaroid to proof for the "real" film. I'm not Consindas nor Warhol, but Polaroids by them are precious art objects.
I like the Polaroid 100, metal body and tripod ready. Do a battery conversion and the only problem is you will occasionally find one with a bad electronic board easy to make a pin hole camera out of those. clean the rollers, and start shooting. The 110 a and B's are the Cadillac's. The only tools I use are a hacksaw and file, mine may not be as pretty as the pro's conversations but they work great. Only problem is finding the camera for a decent price with a good lens, then get a back, I have even used backs from the 100's, a lot more work testing and fitting. Plus lots of information to be found on line.
https://farm3.staticflickr.com/2843/...2a146259_h.jpgScorn by a.rodriguezpix, on Flickr
https://farm8.staticflickr.com/7311/...91ba1bda_h.jpgthe Grave, that knows what infinite dreams I keep, (o Grave, the poet's friend forever, thou!) all through the night bereft of exiled sleep, by a.rodriguezpix, on Flickr
https://farm6.staticflickr.com/5509/...ef0dfd47_h.jpgAnd like remorse the worm will gnaw you in your sleep. by a.rodriguezpix, on Flickr
https://farm4.staticflickr.com/3722/...151c4835_h.jpga.brujo.rodriguez-7 by a.rodriguezpix, on Flickr