My understanding is that there is a lens code rather than a
description.  This way they can put new codes in new lenses.  It is up
to the firmware of the camera or the raw converter to translate the
code into a descriptive name of the lens.  So when Sigma, Tokina and
Tamron pick a code, they have to pick one that already exists so the
camera firmware will recognize something.  The real problem comes when
there is not a fairly equivalent lens from Pentax.

My 2 cents...

-- 
Bruce


Thursday, March 23, 2006, 3:16:20 PM, you wrote:


AR> On Mar 23, 2006, at 6:12 PM, Godfrey DiGiorgi wrote:

>> As I said: Pentax F, FA, DA, D-FA lenses only.
>> Pentax A, A* lenses don't have the ROM data.

AR> Yes... but Cristian's Sigma shows up as a Pentax A lens?

AR> -Aaron


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