I also have the Pentax adapter, and never noticed any infinity focus
problem.  As Paul stated, it can be a bit tricky to release and remove
the adapter, but the Pentax version come with a little tool that makes
the task easier.
Dan Matyola
http://www.pentaxphotogallery.com/danieljmatyola


On Tue, Sep 11, 2012 at 2:07 PM, Paul Stenquist <pnstenqu...@comcast.net> wrote:
> I found some third-party adapters to be a poor fit, which can lead to 
> problems. The Pentax adapter works fine, but to release it, you have to reach 
> into the gap in the adapter and lift the little spring that locks it in 
> place. Never had problems with infinity focus.
> Paul
>
>
> On Sep 11, 2012, at 1:50 PM, Steve Cottrell <co...@seeingeye.tv> wrote:
>
>> Hi team,
>>
>> Had a question from a mate - I don't know the answer but I told him I
>> knew a group of people who might ;-)
>>
>> --------------
>>
>> in your Pentax days, did you ever use an M42 to K-mount adapter?
>>
>> ...and if you did, did you have any problems with the adapter sticking
>> on the body or with infinity focus?
>>
>> I've trawled the Pentax forums, most recommend the genuine Pentax
>> adapter which is expensive and hard to find - But, the genuine Pentax
>> adapter itself is by all accounts, not perfect...
>>
>> Wondering whether to chance it with a cheapo alternative.
>>
>> ---------------
>>
>>
>> Any experience with this?
>>
>> TIA
>>
>>
>> --
>>
>>
>> Cheers,
>>  Cotty
>>
>>
>> ___/\__
>> ||   (O)  |     People, Places, Pastiche
>> ----------      http://www.cottysnaps.com
>> _____________________________
>>
>>
>>
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