Definition
The Canon EF 500mm lens is a family of interchangeable super‑telephoto prime lenses designed for Canon’s EF (Electro‑Focus) mount, primarily used on full‑frame and APS‑C DSLR and mirrorless cameras. The lenses have a fixed focal length of 500 mm and are engineered for professional applications such as wildlife, sports, and astrophotography.
Overview
Canon has produced several variants of the 500 mm focal length under the EF mount, each differing in maximum aperture, optical stabilization, and construction materials. Notable models include:
- EF 500mm f/4.5 L USM – Introduced in the mid‑1990s, featuring a Super‑Spectra coating, ultrasonic motor (USM) autofocus, and L‑series build quality.
- EF 500mm f/4 L IS USM – Launched in the early 2000s, this version added optical image stabilization (IS) while retaining a constant f/4 maximum aperture.
- EF 500mm f/4 L IS II USM – Announced in 2010, it incorporates a second‑generation IS system, an upgraded optical formula, and a carbon‑fiber reinforced barrel for reduced weight.
- EF 500mm f/4.5 L IS USM – Released in the late 2010s, offering a slightly slower f/4.5 aperture with modern IS and an improved internal focusing mechanism.
All lenses in the series are part of Canon’s “L” (Luxury) line, indicating professional‑grade optics, weather sealing, and robust construction. They are commonly paired with teleconverters (1.4× or 2×) to achieve even longer effective focal lengths while preserving autofocus capability.
Etymology/Origin
- EF – Acronym for “Electro‑Focus,” denoting Canon’s fully electronic lens‑mount system introduced in 1987, which enables electronic communication of aperture, focus, and image‑stabilization data between the lens and camera.
- 500 mm – Indicates the lens’s focal length, dictating a narrow angle of view (approximately 4° on a full‑frame sensor) and high magnification.
- L – Designates Canon’s professional “Luxury” series, characterized by superior optical performance, durable weather‑sealed housings, and the use of specialized glass elements.
- IS – Stands for “Image Stabilization,” a lens‑based system that compensates for camera shake, allowing slower shutter speeds without motion blur.
- USM – Refers to “Ultrasonic Motor,” a fast, near‑silent autofocus drive mechanism.
Characteristics
| Feature | Typical Specification |
|---|---|
| Focal Length | 500 mm (fixed) |
| Maximum Aperture | f/4 or f/4.5 (depending on model) |
| Minimum Aperture | f/32 |
| Optical Construction | 13–16 elements in 10–12 groups (varies by version) |
| Image Stabilization | Up to 4–5 stops of correction (second‑generation IS in later models) |
| Autofocus Drive | Ring‑type USM with internal focusing |
| Minimum Focus Distance | Approximately 2.0 m (6.6 ft) |
| Maximum Magnification | ~0.18× (varies with teleconverter use) |
| Filter Thread | 82 mm (for most recent models) |
| Dimensions | Around 165 mm (diameter) × 280 mm (length) |
| Weight | 3.1–3.5 kg (6.8–7.7 lb) depending on version |
| Special Features | Weather‑sealed housing, carbon‑fiber barrel (II version), fluorite and UD glass elements for chromatic aberration control, focus limiters, customizable focus ring travel. |
The lenses deliver high resolution, low chromatic aberration, and a shallow depth of field conducive to isolating subjects at great distances. Their large front element and telephoto design make them physically substantial and require careful handling, often with a tripod or monopod.
Related Topics
- Canon EF mount – The electronic lens mount standard used by Canon EOS DSLR and mirrorless cameras.
- Super‑telephoto lenses – Lenses with focal lengths typically exceeding 300 mm, used for distant subjects.
- Canon L‑series lenses – The professional line of Canon lenses distinguished by superior optical design and rugged construction.
- Image Stabilization (IS) – Technology that reduces the effect of camera shake, especially important at long focal lengths.
- Ultrasonic Motor (USM) technology – Fast, silent autofocus system employed in many Canon lenses.
- Teleconverters – Auxiliary optics that increase the effective focal length of a lens (e.g., Canon Extender EF 1.4×, EF 2×).
- Wildlife photography – A primary application area for 500 mm lenses due to their ability to capture subjects at considerable distances.
- Sports photography – Another common use, where rapid autofocus and high image stabilization are advantageous.