Actually, you can do full-time MF with micro-motors, you just need to use a clutch mechanism like the Canon 50/1.4 USM uses. IIRC the micro-motor SDM lenses do this also (and it's the same setup as with the screwdriver DA lenses with QSF). There is no inherent FTM focusing unlike with ring-type USM.
-Adam On Sat, Feb 6, 2010 at 11:16 AM, Thibouille <[email protected]> wrote: > Adam, I'm afraid micro motors do not permits full time MF correction per se. > Canon uses (used?) cheap micro motors as well in a couple lenses like > Canon 50/1.8 and thiose lenses do NOT provide manual focus override > but using the AF/MF switch on the lens. > > AFAIR, the Tokina/Tamron with built-in motors do not permit MF override > either. > > -- > Thibault Massart aka Thibouille/Thibs > ---------------------- > Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, > DA50-135, DA50-200, 360FGZ ... > Laptop: Macbook 13" Unibody SnowLeo/Win7 > Programing: Delphi 2009 > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
