Want an ultra cheap lens for your Canon EOS R or RP? This may be it.

The Chinese company Brightin star  released a 55mm 1.8 full frame lens for the Canon RF mount.

I'm not quite sure you can find a cheaper lens than this, which retails for around $99.95.

The MTF's actually don't look that bad for a straight forward optical design. While it's no RF 50mm 1.2, it may be a fun manual focus lens to use.