On Sun, Apr 12, 2009 at 12:12:02PM -0400, Adam Maas scripsit: > On Sun, Apr 12, 2009 at 12:05 PM, Graydon <[email protected]> wrote: > > On Sun, Apr 12, 2009 at 07:14:34AM -0600, William Robb scripsit: [snip] > >> I hate to say it, but the big boys in the sandbox seem to be able to get > >> fast and accurate out of their AF systems. > > > > Generally at the cost of the manual focus, though, and so far as I can > > tell (never having had my hands on one), the 55/1.4 is effectively a > > manual focus lens with a very long focus throw that happens to have had > > an SDM auto-focus motor included. > > > > Which is one of those design decisions you could certainly wish they > > publicized more. > > > > -- Graydon (or it's just the SDM motor is one size too small...) > > If that's the case, bravo for Pentax in doing this with a lens that > will get a lot of MF use. One of the biggest problems with using AF > lenses in manual is the short focus throws. That's one major reason > why I'm slowly replacing my last few AF Nikkors with MF equivalents.
I don't think it's a *BAD* design decision; it's got obvious benefits for the intended uses of the lens. It does strike me as the sort of thing an able marketing department would announce vigorously as a feature, rather than having people discover it -- expecting something else -- and regard it as a bug. -- Graydon -- 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.
