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
[email protected]
http://gallery.me.com/jomac
http://web.me.com/jomac/show.me/Blog/Blog.html
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