The following terms are commonly used in Pentax lens names and descriptions.
|Limited||Compact, top quality|
|ED||Extra-low dispersion element|
|SDM||Supersonic drive motor|
|Quick Shift||Manual focus adjustments can be made|
in AF mode simply by moving focusing ring
|OS||Optical Stabilizer (Sigma)|
|HSM||Hypersonic Drive Motor (Sigma)|
Pentax produced several series of lenses over the years. Series in active development include the DA (digital-only), DA L (budget kit lenses) and D-FA (digital-optimized full-frame ); some FA (full-frame) lenses are also still in production. Basic differences between them are outlined in the table below. Read more about the different series here.
|Autofocus||Quick Shift||Auto-Aperture||Aperture Ring||DSLR-Compatibility|
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