I'm interested in experimenting with the reverse lens to shoot macro but as this is all an experiment, I don't want to spend that much money on it. I've been watching this Youtube video and they said you can buy a wide 28mm lens around $50. This was a prime lens with a manual aperture. I've been searching online but so far the cheapest I could find was at least a couple of hundred dollars and no manual aperture.
Does anyone know a cheap prime 28mm lens with a manual aperture that I can mount on a Canon 6D?
P.S. By manual aperture I mean a lens with an aperture ring.