Page 30 of the operation manual

Started Jan 25, 2008 | Discussions thread
OP Russell Evans Forum Pro • Posts: 12,617
Lens Abbreviations for Sigma, Tamron, and Pentax

Alvane posted these three replies in a thread about the meaning of different manufacturer's lens abbreviations. Thank you Alvane for doing all the leg work and providing a hat trick of great posts in one thread.
Sigma abbreviations
-ASP (Aspherical Lens)

The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size.

-APO (APO Lens)

In order to attain the highest quality images, the APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration.

-OS (Optical Stabilizer) Function

This function utilizes a built-in mechanism that compensates for camera shake. It dramatically expands photographic possibilities by alleviating camera movement when shooting by hand held camera.

-HSM (Hyper-Sonic Motor)

This lens uses a motor driven by ultrasonic waves to provide a quiet, highspeed AF.

-RF (Rear Focus)

This lens is equipped with a system that moves the rear lens group for highspeed , silent focusing.

-IF (Inner Focus)

To ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length.

-Conv (APO Teleconverter EX)

This lens can be used with the APO Teleconverter EX. It can increase the focal length and will interface with the camera's AE (automatic exposure) function.

-EX (EX Lens)

The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.
Tamron abbreviations

-AD A lens with Anomalous Dispersion element(s), a special optical glass which delivery large partial dispersion ratios relative to a specific light wavelength zone.
-AF Autofocus

-ASL Aspherical Lens Elements. A type of lenses that virtually eliminates the problem of coma and other types of lens aberration. The are particularly good at correcting distortion in wide-angle lenses as well as contributing to a lighter and smaller lens design.

-Di Digitally Integrated Design. Optical system designed to meet the performance characteristics of DSLR cameras as well as film cameras. Lenses can be used with either Digital or Film SLR cameras.

-Di II Digitally Integrated Design. Lenses made exclusively for digital SLR cameras with image sensors smaller than 24mm x 16mm (APS-C). Features high resolution performance incorporating anti-reflection coating and optical configurations to compensate for internal reflections and ghosting. Peripheral light fall off, more noticeable with digital cameras, is also reduced. Also provide ideal focal lengths to cover the range desired by DSLR users. Not designed for Full Frame Digital SLR cameras.

-HID High Index High Dispersion Glass element. Minimises on-axis and lateral chromatic aberrations.

-IF Inner Focus. The lens is able to focus without physically changing its size, where optical movement is limited to the interior of the non-extending part of the lens barrel, allowing for a more compact and lightweight lens as well as closer focusing distances.
-LAH LD Hybrid aspherical elements.

-LD Low Dispersion elements which effectively compensate for chromatic aberration that is a problem at the telephoto end and lateral aberration at the wide angle end.

-MACRO Used on those lenses which have the ability to be used for close up (macro) photography. Tamron puts MACRO on those lenses that provides a magnification ration of 1:4 or greater, indicating it is capable of providing macro results.

-SP Super Performance. High performance Specifications. The first priority in producing these lenses have been superior specifications and outstanding performance free from cost restraints.

-VC Vibration Compensation. Uses a 3 coil system allowing lenses to remain compact in size. Gives smooth and steady images in the viewfinder.

-XR Hi Refraction index glass elements resulting in minimum aberration. Allows smaller lens diameters while maintaining aperture values for overall compactness.

-ZL Zoom lock mechanism. Prevents undesired barrel extension whilst carrying the camera-lens around, thus protecting the lens.
Pentax abbreviations
SMC: Super Multi Coating
FA: fits full 35mm sensor(film cameras), also fits digital cameras
FA-J: budgetlenses made for full 35mm sensor, no aparture ring
FA Star: Top serie for 35mm film cameras
DA: made for the reduced sensor in digital cameras, does not work with film-slr
DA*: Top serie for digital cameras, weatherproof, does not work with film-slr
D-FA: Adjusted to digital cameras, but also works on film-slr
SDM: Super Direct-drive Motor (ultrasonic autofocus)
ED: Extra-Low Dispersion-glass
IF: Internal Focus
SP: Super Protect coating
AL: Aspherical Lenses

Thank you

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