If you don't have a choice, you have your answer. Learn how to make the very best with what you have. I don't think you will be too disappointed.
Peter
Peter's quote is more than great advice.
Yes pulling back gives you essentially a longer focal length look, though there are ways to make this a plus.
I use an 80mm all the time on 1.26 cropped sensor backs.
I like the slight excaggeration and it seems to bring the viewer more in the moment, than a longer lens that can give an at a distance feel.
I guess in real world terms that makes it something close to a 100mm (I'm not going to pull out my iphone to calculate), but remember all lenses have a different characteristic and look. An 80mm from one maker can look very different from another.
On my Contax I shoot a lot of horizontal, usually not worrying if I'll crop vertical or not, with a waist level finder, because it forces you into a slightly different angle and in a way also feels more personal.
I use the 55mm also and if you really learn a lens, you can get a lot of looks out of it.
This is basically a gear forum, always talking the latest and greatest, but great photographers from the past, usually worked with only a few lenses, sometimes just one focal length.
They knew it, breathed it and understood how to make any lens work for what they wanted.
IMO
BC