AF lenses on AF 1.7X adapter

P. J. Alling webster26 at
Mon May 5 13:19:28 EDT 2008

It does so have to, it just doesn't want to...

Mark Roberts wrote:
> Dario Bonazza wrote:
>> Hi all,
>> I've been asked this question, but couldn't answer it. What happens by 
>> matching a DA* 300mm AF lens (or any other SDM lens) with the AF 1.7X 
>> converter? Do both AF devices (the SDM one in the lens and the screwdriver 
>> type in the adapter) start & try to autofocus?
> That couldn't happen because the 1.7xAF converter doesn't have to 
> electrical contacts necessary for SDM focusing.

Vote for Cthulhu. Why settle for a lesser evil...
   -- Dr. Jerry Pournelle 

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