Are you turning the camera off when changing lenses? According to page 67 of the K20D manual you only get the prompt to supply the focal length when the camera is power cycled; simply changing lenses while the camera is in use doesn't seem to be enough. (That matches the behaviour I observe on my K10D).
On Sun, May 17, 2009 at 08:28:19PM -0700, Joseph McAllister wrote: > Then that's an error on the part of Pentax, isn't it? Unless the AF 1.7x > passes "something" the K20, which it in turn would incorrectly interpret > as "something else", then the lens focal length screen should pop up and > allow you to put in the combo's focal length. Yes? > > > On May 17, 2009, at 17:10 , P. J. Alling wrote: > >> The K20D can't get anything from the A*300 or any other lens if >> mounted using the AF 1.7x, there's no pass through for the digital >> pin. There's no digital pin on the A*300 in any case. Now the AF 1.7x >> might be supplying some kind of focal length information but it would >> be erroneous, since it has no idea what the focal length of the mounted >> lens is either, (the A contacts don't pass that information). >> Joseph McAllister wrote: >>> This might be why my K20 did not ask the focal length of my A* 300 >>> ?4 when attached to the AF 1.7x tc. It should have, but perhaps it >>> DID get something from the 300 as to focal length. Of course, the >>> photos were soft on tripod, so maybe I should have gone to the >>> Custom Functions and forced a 500mm reading. (There was camera >>> movement, as the tripod was not my sturdiest) >>> >>> On May 17, 2009, at 12:14 , Adam Maas wrote: >>> >>>> but also impractical to >>>> evaluate all F and later lenses (A and earlier lenses don't identify >>>> the model to the camera and therefore couldn't support the feature >>>> in-camera) > > Joseph McAllister > pentax...@mac.com > > http://gallery.me.com/jomac > http://web.me.com/jomac/show.me/Blog/Blog.html > > > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
