AL: aspherical lens = to correct image errors
AW: All Weather = dust and splash-proof lenses, better protection than with WR lenses
DA: autofocus lenses calculated for APS-C image circle
D FA: autofocus lenses calculated for KB image circle
HD: High Definition = Multiple remuneration to reduce reflections
DC: Direct Current = DC Focusing Motor
ED: Extra Low Dispersion = with lens element made of special glass with very low color dispersion
IF: Internal Focusing
QS: Quickshift Focus System = manual focusing without switching off the autofocus
SDM: Supersonic Direct Drive Motor = Focusing micromotors
SMC: Super Multi Coating = high-quality compensation
SP: Super Protection = dirt repellent coating
WR: Weather Resistant = sealed against dust and water penetration
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