The Leica M5 was a groundbreaking rangefinder camera introduced in 1971, notable for being the first Leica M series camera with through-the-lens (TTL) metering. Despite its initial mixed reception, it is now considered an underrated classic among rangefinder enthusiasts. The M5 featured a unique design with a larger, more angular body compared to previous M models, and introduced innovative metering technology with a CdS cell on a swinging arm.