"Tim Munro" wrote:
|
| The Tamron 1.4x convertors do not have a chip to alter the information
from
| lens to camera, even the SP series convertor. That is why the maximum
| aperture display, and focal length recorded, is always incorrect. The
camera
| exposure will be correct though without any compensation. The Tamron 2x
| convertor does alter the info.
____________________________________________________________________________
_
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.
BTW, the 1.4x SP Tamron is superb.
Peter K
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
