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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