Camera Lens Markings Explained: A Guide to Acronyms & Numbers

Understanding Camera Lens Markings

When you look into the front element of a camera lens, you'll often see a series of letters, numbers, and abbreviations. Deciphering these markings can seem daunting, but they provide valuable insights into the lens's capabilities.

Decoding the Lens Nomenclature

These markings aren't random; they represent specific technical details about the lens. Understanding these codes allows photographers to translate them into practical knowledge.

This information was originally sourced from a question posed on Photography Exchange.

Photography Exchange is a dedicated section within Stack Exchange, a network of community-based question and answer websites.

The accompanying image illustrating this discussion is provided courtesy of Canon, USA.

Key Takeaway: Lens markings are a shorthand way for manufacturers to communicate important specifications to photographers.

Understanding Camera Lens Markings

A Photography Exchange reader, Mikal Sundberg, recently inquired about the various markings found on camera lenses.

He noted the abundance of acronyms within lens names, which often detail specific features – frequently unique to each manufacturer.

Let's break down how to interpret these designations from prominent brands.

Nikon Lens Nomenclature

Consider the following Nikon examples:

• Nikon AF-S DX 16-85mm VR f/3.5-5.6G IF-ED
• Nikon AF-I 600mm f/4D IF-ED
• Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED

Each component of the name signifies a particular characteristic of the lens.

Canon Lens Nomenclature

Canon lenses also employ a system of abbreviations. Here are some illustrations:

• Canon EF 85mm f1.2L USM Mark II
• Canon 70-300mm f/4.5-f/5.6 DO IS

These markings indicate the lens's capabilities and features.

Sigma Lens Nomenclature

Sigma lenses utilize a similar approach to convey technical details. Examples include:

• Sigma 150mm F2.8 EX APO DG HSM Macro
• Sigma 70-200mm F2.8 EX DG OS HSM
• Sigma 50-150mm F2.8 EX DC APO HSM II

Decoding these names requires understanding the meaning behind each abbreviation.

Deciphering the Code

The question then becomes: what tools are needed to understand this complex system of lens naming?

Essentially, a comprehensive understanding of manufacturer-specific terminology is key to interpreting these lens designations.

Understanding Camera Lenses

A comprehensive explanation regarding camera lenses is offered by Photography Exchange contributor Jrista. This detailed response is structured to assist you in identifying the specific type of camera equipment you possess.

Manufacturer Lenses

The majority of prominent camera manufacturers produce their own lens lines. These lenses generally adhere to the most rigorous quality control standards, often reflected in a higher price point.

Canon Lens Nomenclature

Canon employs specific terminology to denote the features incorporated into each lens:

• Basic Specifications
  • XYZmm: Indicates the focal length of the lens.
  • f/x.y: Represents the maximum aperture available.
• Focus & Mount Types
  • EF: Electronic Focus – designed for full-frame Canon DSLRs.
  • EF-S: Short-Back Electronic Focus – intended for Canon APS-C DSLRs.
  • EF-M: Mirrorless Electronic Focus – compatible with Canon mirrorless cameras.
  • TS: Tilt-Shift – allows for perspective control and creative effects.
    • TS-E: Tilt-Shift with electronic aperture control.
  • MP-E: Macro-Photography with electronic aperture control.
• Key Features
  • IS: Image Stabilization – reduces camera shake for sharper images.
  • USM: Ultrasonic Motor – provides fast and quiet autofocus performance.
  • STM: Stepping Motor – offers smooth and quiet autofocus, ideal for video.
  • (Mark) N: Lens Version – indicates the generation of the lens (Mark II = v2, Mark III = v3, etc.).
  • DO: Diffractive Optics – utilizes a unique optical element to reduce chromatic aberration.
  • L: Luxury Series – Canon’s professional-grade lens line.
  • Macro: Close-focusing capability, though not necessarily 1:1 magnification.
  • Softfocus: Enables the creation of images with a soft, dreamy aesthetic.
  • PF: Power Focus – allows for precise focus control.

Illustrative Examples

• Canon EF 16-35mm f/2.8 L II USM Lens
• Canon EF 70-200mm f/2.8 L IS II USM Lens
• Canon TS-E 17mm f/4 L
• Canon EF 50mm f/1.2 L USM
• Canon EF-S 10-22mm f/3.5-4.5 USM

Nikon Lens Designations

Nikon utilizes the following terms to specify the characteristics of its lenses:

• Core Specifications
  • XYZmm: Represents the focal length.
  • f/x.y: Denotes the maximum aperture.
• Lens Systems
  • DX: Digital, Short Back – designed for Nikon APS-C DSLRs.
  • FX: Full Frame – compatible with both Nikon full-frame and APS-C DSLRs.
• Lens Mounts
  • AI: Automatic Indexing mount – includes a metering sensor.
  • AI-S: Improved Automatic Indexing mount.
  • IX: Designed for APS film SLRs; not compatible with 35mm film or digital DSLRs.
  • Serie E: A more affordable series utilizing plastic components.
• Focusing Mechanisms
  • AF: Auto Focus – built into the camera.
  • AF-S: Auto-Focus Silent – utilizes a Silent Wave Motor.
  • AF-I: Auto-Focus Internal.
  • AF-N: Auto-Focus (improved version, less common).
• Notable Features
  • Reflex: Catadioptric (mirror) lens.
  • D: Distance – communicates focus distance for metering and flash exposure.
  • SWM: Silent Wave Motor.
  • N: Nano-Crystal Coating.
  • NIC: Nikon Integrated Coating.
  • SIC: Super Integrated Coating.
  • VR: Vibration Reduction.
  • ED: Extra-low Dispersion Glass.
  • FL: Fluorite.
  • ASP: Aspherical Lens Element.
  • IF: Internal Focusing.
  • RF: Rear Focusing.
  • RD: Rounded diaphragm.
  • Micro: High reproduction ratio (typically 1:1 or 1:2).
  • G: No aperture ring.
  • DC: Defocus Control.
  • PC: Perspective Control.
  • E: Electronic diaphragm.
  • P: CPU enabled version of AI-S lenses.

Example Lenses

• Nikon AF 85mm f/1.8
• Nikon AF 85mm f/1.8D
• Nikon AI 500mm f/4.0 P
• Nikon AF-S DX 16-85mm VR f/3.5-5.6G IF-ED
• Nikon AF-I 600mm f/4D IF-ED
• Nikon AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED

Olympus 4/3 Lens Characteristics

• Common Specifications
  • XYZmm: Focal length.
  • 1:x.y: Maximum aperture.
• Key Features
  • ED: Extra-low dispersion glass elements.
  • SWD: Supersonic Wave Drive Motor.
  • N: Lens version (II = v2, III = v3, etc.).

Pentax Lens Terminology

• Common Specifications
  • XYZmm: Focal length.
  • 1:x.y: Maximum aperture.
• Focus/Mount Types
  • K, M: Manual Focus, Manual/Aperture priority metering.
  • AF: Early AF system.
  • A: Manual Focus, supports Shutter priority and Program exposure metering.
  • F: Adds Auto Focus.
  • FA: Adds MTF communication to the body.
  • FAJ: Removes the aperture ring.
  • DA: Optimized for APS-C sensors.
  • DA L: Lighter construction.
  • D FA: Usable on both film and digital cameras.
• Features
  • AL: Aspherical elements.
  • ED: Extra-low dispersion glass elements.
  • SMC: Super multi coating.
  • HD: High-grade multi-layer coating.
  • PZ: Power Zoom.
  • SDM: Supersonic Drive Motor.
  • IF: Internal focussing.
  • WR: Weather Resistant.
  • AW: All Weather.
  • ★: High performance, weather and dust sealing.
  • Limited: High quality, compact design.
  • Macro: 1:1 magnification.
  • XS: Extra slim.

Sony/Minolta Lens Specifications

Sony lenses, formerly Minolta, share similarities with Nikon and Canon in their feature notation:

• Common Specifications
  • XYZ/x.y: Focal length/Maximum Aperture.
• Lens Mount Types
  • Alpha: α Type Mount.
  • E: E Type Mount.
• Focusing Systems
  • SSM: Super-sonic Motor.
  • SAM: Micro Motor.
• Key Features
  • G: Gold Series (highest quality).
  • (D): Distance Encoding.
  • DT: Digital Technology.
  • APO: Apochromatic correction.
  • OSS: Optical Steady Shot.
  • T*: High-performance Coating.
  • M: 1:1 magnification.
  • Z: Optical engineering by Carl Zeiss.

Example Lenses

• Sony Alpha 70-200/2.8 G
• Sony Alpha 28-75/2.8 SAM
• Sony Alpha DT 18-250/3.5-6.3
• Sony E 18-200/3.5-6.3 OSS
• Sony Alpha 100/2.8 Macro

Third-Party Lens Manufacturers

Numerous third-party lens manufacturers produce lenses compatible with various camera bodies.

Sigma Lens Features

Sigma lenses utilize specific terms to indicate their features.

Tamron Lens Characteristics

Tamron lenses offer a wide range of features, particularly concerning chromatic aberration.

Tokina Lens Specifications

Tokina lenses employ the following terms to denote their features.

Samyang Lens Designations

Samyang lenses (also sold as Pro-Optic, Rokinon, Bower) use the following terms.

For further clarification on lens terminology, Photography Exchange user Hamish Downer provides additional insights:

The initial response effectively decodes the lens abbreviations. It’s important to understand the implications of these features.

Lenses for Reduced Frame DSLRs

Many DSLRs have sensors smaller than a 35mm film frame. Using a full-frame lens on these cameras results in unused light around the sensor. Lenses designed for these cameras are smaller and lighter, but may exhibit dark corners on full-frame bodies.

The codes for reduced frame lenses are:

• Canon: EF-S
• Nikon: DX
• Pentax: DA
• Sigma: DC
• Sony/Minolta: DT
• Tamron: Di II

Image Stabilization

Image Stabilization, also known as Optical Stabilization or Vibration Reduction, minimizes camera shake. Some DSLR bodies also incorporate in-body image stabilization.

• Canon: IS
• Nikon: VR
• Panasonic: OIS
• Sigma: OS
• Sony/Minolta: OSS
• Tamron: VC

Fast and Quiet Focusing Motors

High-end lenses utilize quieter and faster focusing motors with lower battery consumption.

• Canon: USM
• Nikon: SWM
• Olympus/Zuiko: SWD
• Pentax: SDM
• Sigma: HSM
• Sony/Minolta: SSM
• Tamron: USD

Lens Features for Image Quality

Various lens features reduce chromatic aberrations and other imperfections.

• Aspherical lens elements improve image quality by reducing aberrations.
• Low dispersion glass minimizes chromatic aberration.
• Apochromatic lens elements provide superior chromatic aberration correction.

Lens Coatings

Lens coatings reduce internal reflections and improve image clarity.

Macro Lenses

Macro lenses enable close-up photography with a 1:1 magnification ratio.

Focusing Systems

Internal and rear focusing systems improve focusing speed and prevent lens movement during operation.

High-End Lens Series

Manufacturers designate their premium lenses with specific codes.

Additional Considerations

Other codes indicate mount type, compatibility with teleconverters, and autofocus motor requirements.

For a more in-depth discussion and further contributions from the community, please refer to the original thread.