Frits Wüthrich wrote: > On Friday 09 February 2007 20:18, Godfrey DiGiorgi wrote: >> On Feb 9, 2007, at 7:03 AM, Micah B. Kleit wrote: >>> Doing my usual morning browsing through B&H, I found a tamron lens >>> coming soon; don't know if this has come up before: >>> >>> http://www.bhphotovideo.com/bnh/controller/home? >>> O=Search&A=details&Q=&sku=363813&is=REG&addedTroughType=search >>> >>> There's a "MF-AF" switch at the base. Is it possible that this is a >>> USM lens? >> Given that the red "index dot" on the lens mount looks like it will >> align properly with the Canon bayonet lens mount and not with a >> Pentax lens mount, I suspect the picture shows a Canon version of the >> lens. All Canon mount lenses have the AF/MF switch on the lens mount. >> >> Godfrey > The lens is already on the market since 2004 for two other brands. No mention > of the AF system though. > http://www.tamron.com/news/35mm/1118di2.asp
It's screwdriver drive. Tamron only does in-lens motors on Canon, and even then it's just traditional DC drive, not USM in any variant. Only Sigma and Leica do aftermarket USM motors (Sigma calls these HSM, leica doesn't specify, but as far as I'm aware both Leica D lenses for 4/3rds are USM drive) -Adam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
