Pentax AF 1.7x is back in production???

[P. J. Alling]

I've auto focus effectively on the MZ-3 and *ist D with the 1.7x and 
A*300mm f4.0.  It hunts quite a bit in dim light and sometimes doesn't 
get a lock, but it's very useful in bright daylight.  Remember, you have 
to get at least close with the manual focus ring before auto focus will 
work.

Adam Maas wrote:
> Joseph Tainter wrote:
>   
>> IIRC, it is still listed as available from the UK Pentax site, new 
>> stock.  Quite a reasonable price, too.
>>
>> -----
>>
>> Mike, do you have a url for anyplace online that could sell me one?
>>
>> Also, does anyone know if you would still have autofocus using this on 
>> an F4 lens? The effective maximum aperture would be F6.3, I believe. I 
>> am thinking of my F* 600 F4.
>>
>> Thanks,
>>
>> Joe
>>
>>     
>
> According to the specs, it's f2.8 and larger. Dunno if it would work in 
> practice though.
>
> -Adam
>
>