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
ƒ4 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
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