> Baloney. First, there is not a chip in the converters.
> Second, its the number of contacts that is different.
> Older converters have less contacts and do not interact with the
body
> electronics
> as the newer TCs do. The new SP converters from Tamron are
indentical in
> operation
> to the Canon's, as are the new beige color Kenko's.
> The major difference is there is no protruding element on the 3rd
party TCs
> allowing you
> to use them with focal lengths that are normally not permitted with
Canon's
> TCs.
Talking of Baloney: the major difference is in optical quality. I
have both Canon and Non-Canon. There is no comparison. The
protruding element is not there for decoration.
As to chips ... I'm intrigued how the number of contacts alone tells
the lens which converter I have in place. If it were so simple ...
straight through conduction, surely the 3rd parties could have copied
that.
My Canon 1.4 and 2.0 converters have an identical number of contacts
(front and back). How does the camera/lens know which is in place and
adjust aperture accordingly? I'm intrigued to know.
Bob
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