Canon's bellows macro lens — the FL 100mm f/4 designed for macro with bellows system.
The Canon FL 100mm f/4 FLM Bellows Lens is a specialised macro optic designed for use with Canon's bellows focusing system. It is not a conventional camera lens — it requires a bellows unit for focusing. The FL mount predates the FD mount. Designed for high-magnification close-up work using bellows extension.
Optical performance is optimised for macro — excellent flat-field sharpness at close range. The lens is designed specifically for close-up distances with bellows and may perform poorly at infinity. The f/4 aperture is adequate for macro work. Build quality is solid vintage Canon with precision metal construction.
Canon FL mount — the mount predating Canon FD. Requires bellows for focusing — not a standalone lens. Weight is minimal. Build quality is vintage precision. The bellows provide variable extension for different magnification ratios. The FL mount limits compatibility to FL-mount cameras or adapters.
Uncommon vintage specialist. Check clean optics and FL mount condition. A specialist macro tool from Canon's pre-FD era. Not a standalone lens — requires bellows. Only of interest to vintage macro specialists and Canon FL system collectors. The Canon FD 100mm f/2.8 Macro is dramatically more practical.