This was my first real hands-on experience with a third-party RF mount lens system under Canon, and specifically from Tamron. Coming from a long-term user background of native systems and especially lenses from Sigma, this experience felt like a direct comparison between ecosystems, philosophies, and engineering priorities. What I tested here was the Tamron 18–300mm APS-C zoom lens for RF mount. Tamron RF Lens The RF Mount Is Opening Up: A Quiet but Important Shift The first