Two Vintage Canon Lenses, Different Strengths

If you're considering a used Canon lens for classic or digital mirrorless shooting, the Canon 55mm f/1.2 FL and the Canon 100mm f/2 FD represent two distinct eras and purposes. The 55mm offers an ultra-fast aperture for low light and shallow depth of field, while the 100mm provides a longer reach ideal for portraits and compression. Both are available in used condition at Austin Camera, but their differences go beyond focal length.

What the Listings Confirm

  • Canon 55mm f/1.2 FL Lens - USED: In Excellent cosmetic condition with very minimal exterior wear. The focus barrel and aperture ring rotate smoothly with appropriate amount of resistance. Glass optics are in Excellent condition, free of scratches, haze, fungus or separation. This confirms the 55mm f/1.2 FL is fully functional with clear optics, making it a reliable choice for available-light photography.

    Canon 55mm f/1.2 FL Lens - USED

    Canon 55mm f/1.2 FL Lens - USED

  • Canon 100mm f/2 FD Lens - USED: In Excellent Condition. Clean with very little wear other than a few light marks. Optics are in very nice condition with a noticeable spec dust but no scratches, haze or any other defects. The 100mm f/2 FD has minor dust that is not noticeable in images due to the focal length, so it won't affect photo quality.

    Canon 100mm f/2 FD Lens - USED

    Canon 100mm f/2 FD Lens - USED

Compatibility and Mount Differences

The Canon 55mm f/1.2 FL uses the Canon FL mount, which was introduced in the 1960s and is mechanically compatible with FD-mount cameras but lacks full auto-exposure coupling. The Canon 100mm f/2 FD uses the newer FD mount, offering full aperture coupling with FD cameras and easier adaptation to mirrorless systems. If you plan to adapt to a modern camera, the FD mount is generally simpler to use with standard adapters.

Key Differences at a Glance

Focal length and maximum aperture are the main specs, but mount type and handling also differ.

  • Focal Length & Aperture: 55mm f/1.2 vs 100mm f/2. The 55mm is faster and wider; the 100mm offers more reach and a classic portrait perspective.
  • Mount Type: FL mount on the 55mm; FD mount on the 100mm. FD is more widely adapted and offers auto-aperture on FD bodies.
  • Condition Notes: Both are rated Excellent. The 55mm has clean optics; the 100mm has minor dust that does not affect images.
  • Typical Use: 55mm excels in low light and creative blur; 100mm is ideal for portraits and isolating subjects.

Which One Should You Choose?

Your choice depends on your camera system and shooting style. If you want the fastest aperture possible for dreamy backgrounds and dim scenes, the Canon 55mm f/1.2 FL delivers that classic look. If you prefer a longer lens for portraits or need easier mounting on an FD camera or modern adapter, the Canon 100mm f/2 FD is the more practical option. Both are tested and warrantied, so you can buy with confidence.