The Canon FD 135mm f/2.5 is a manual-focus medium telephoto prime for the Canon FD mount, introduced during the FD system era (1971–1987). With a moderately fast f/2.5 maximum aperture, it was designed for portraiture, candid telephoto work and general short-tele use on Canon SLR bodies of the period.

At UK auction in recent years, hammer prices for the FD 135mm f/2.5 have ranged from around £30 for a rough, untested example up to about £190 for a clean copy, with only two recorded saleroom results to draw on. As of 2026 the lens remains one of the more affordable FD short telephotos at saleroom level, and what a tidy example is worth today depends heavily on glass clarity and cosmetic condition. Buyers should remember these are wholesale hammer figures — dealer retail prices for a serviced lens typically sit higher than what it sells for under the hammer.