Canon's budget RF telephoto — basic 75-300mm without IS for the RF-mount system.
The Canon RF 75-300mm f/4-5.6 is Canon's most affordable RF-mount telephoto zoom — providing basic 75-300mm coverage at minimum cost. It lacks IS — the main omission at this price point.
Optically basic — acceptable for casual telephoto use. No IS — a significant omission that the RF 100-400mm f/5.6-8 IS STM addresses. STM motor likely for smooth video AF. The cheapest way to get telephoto reach on RF mount.
Canon RF mount. Budget construction to minimise cost. Full-frame coverage. No IS. The most basic RF telephoto — positioned to replace the EF 75-300mm III at the absolute bottom of the RF lineup.
New to used market. The most affordable RF telephoto available. The RF 100-400mm f/5.6-8 IS STM is dramatically better with IS. Only for absolute budget RF telephoto needs where IS isn't critical.