That's why I love fiddling with analog cameras for a bit, or even experimenting with old lens on newer DSLRs. I have a Canon Rebel from 2011 and sometimes love to use my soviet Zenit Helios 44M lens in it. I do have the Zenit which came with this lens, but I have yet to develop its film.
I've started fiddling with an old Canon 30D again just because it's completely devoid of all the automatic post-processing I've become so used to with my phone camera. It's nice to just see the image as it is.
I used to have an old rebel xti, how do you actually confirm focus shooting like this? as far as I remember there were no aids for manual focus like film slr ground glass or modern mirrorless live view focus peaking.