The Canon Serenar 100mm f/3.5 is a short telephoto rangefinder lens in Leica L39 screw mount, produced under Canon's early Serenar branding before the company standardised on the Canon name. It was designed for portrait and mid-distance work on Canon and Leica screw-mount rangefinder bodies of the late 1940s and early 1950s.

At recent UK auction, hammer prices for the Serenar 100mm f/3.5 have ranged from £40 to £140, with a sale at £81 in March 2025 sitting close to the middle of that spread. As of 2026, saleroom results show the lens typically sells for double-digit to low three-figure sums depending on glass and barrel condition, so what a clean example is worth today is largely a question of cosmetics and optical clarity rather than rarity.