That information has to be transmitted by the lens, I don't have any 
direct evidence but based on the fact that Pentax TCs don't transmit 
corrected focal length information it us highly unlikely Sigma TCs will 
either.

Patrick Genovese wrote:
> One more question... Does the K10D correct the focal length when you
> add the Sigma TC ?
>
> On 8/19/07, Patrick Genovese <[EMAIL PROTECTED]> wrote:
>   
>> I'm going to be needing a long telezoom approx 400mm at the long end
>> for nature photography ... the 50-500 seems to be very popular for
>> this type of photography. How does it compare with 100-300 + 1.4x TC
>> combo ?
>>
>> Regards
>>
>> Patrick Genovese
>>
>>     
>
>
>   


-- 
Remember, it’s pillage then burn.


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