When Canon's mirrorless system launched, the difficulty was finding the lens you wanted. That problem has reversed. The RF catalogue is now broad enough that the real challenge is narrowing it down — working out which specifications actually matter for the pictures you intend to make, and which are simply numbers on a box. This guide covers both halves of that decision: what the mount is and how it relates to Canon's older standards, then the ten things worth checking before you commit to a lens.
Canon mount types explained
The mount is the mechanical and electronic joint where a lens meets a camera body. Each manufacturer sets its own standard, and those standards are not interchangeable — the diameter, the locking mechanism, the distance to the sensor and the electrical contacts all have to correspond. Canon currently has three in circulation, and knowing how they relate saves a good deal of confusion when you start shopping.
What is RF mount?
RF mount is Canon's standard for its mirrorless
