Using vintage lenses makes photography fun – and you get to (re)learn the basics. Manipulation through aperture, shutter speed and ISO, along with manual focus, forces you to concentrate on the subject and the desired outcome. Search those old lenses out. Yard sales, parents’ or grandparents’ closets, online, second hand shops, all can yield cool glass that will guarantee hours of enjoyment and that polishing of your “artistic” skills. Don’t just focus on the internet darlings; any old lens will yield something different, often for a few dollars, or even for free. The flaws or imperfections will give your shots that character that breathes life into the images. No need for apps or filters.
Below: images shot with Fuji XT3, inexpensive Fotasy adapter, Minolta Rokkor 45mm f2 (free, from someone clearing out his basement).