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In this section the most common technical terms will be described. Select the first letter of the abbreviation or term you'd like to search for:A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
L lenses
Canon uses this term to indicate their top of the line lenses (Luxurious) which are ment for the serious user and professional.
In general the buildquality is better and some of the lenses feature a weathersealing against the elements.
LD
The so called APO elements (like the UD, SUD, CaF2, LD, SLD and ED for example) improve sharpness and contrast by reducing the effects of chromatic aberrations that are typically found in telelenses. These elements work by focussing different wavelengths of light to one point, but the effectiveness depends highly on the quality of the glass that is used. The good elements are highly expensive; the good ones are to be found in the more expensive lenses.