AL = anomalous dispersion GLASS element. The aspherics are hybrid - glass with polymer coating like aspheric surface. All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho
-----Alkuperäinen viesti----- Lähettäjä: T Rittenhouse <[EMAIL PROTECTED]> Vastaanottaja: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Päivä: 14. maaliskuuta 2002 17:52 Aihe: Re: 28-70 vs 24-90 vs 28-105 >I look at posts like this and my guts tighten up. Let me translate some of >those acronyms as used for lens of this class. > >IF, internal focusing, means it is a fixed focus lens that instead of >focusing they change the focal length, at closer distances it gets shorter. >A cheaper way to build a zoom lens. > >AL, a molded plastic non-spherical element, instead of several glass >elements. A cheaper way to build a lens. > >Bayonet lens hood, usually plastic, only the manufactures cheap built, >expensive to buy, lens hood will work. > >This is not to say these are not good lenses, but I cringe every time I see >a compromise in build quality flaunted as a feature. > >Ciao, >Graywolf >http://pages.prodigy.net/graywolfphoto - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
