The two versions are USM and non-USM. The non-USM version is discontinued (at least over here, in Belgium). Maybe it's still in stock at B&H. The USM version is Full Time Manual (FTM) and a quick silent beauty when focusing. I tried once the non-USM version on a stand and I'd never go for it after 'tasting' the USM flavor. Once you're baby starts to crawl and walk/run you'll be happy of owning the USM ;-) Greetings, Gerard. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
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