The M42 to K-Mount adapter was designed as part of the transition from
M42 to K-mount in the 1970s to allow owners buy a new Pentax body and
make use of their existing complement of M42 lenses. It is designed to
mount into the K-mount body and lock there in order to facilitate
changing M42 lenses.
- You fit it onto the lens and bayonet the assembly into place to fit
the adapter.
- When you remove the lens from the camera, the mount adapter stays
in place to allow you to use other M42 lenses.
- You release the adapter by slipping a thin screwdriver blade or
feeler gauge into a slot on the adapter to release the catch and then
pull it out of the K-beyonet coupling.
It works perfectly for its intended purpose.
I would never go with cheap alternatives on any lens mounting
component. Good quality alternatives are always useful. :-)
Some of the third party alternatives are good quality: they were
designed to be fitted to the lens and to change with the lens. A key
difference between the good ones and the poor ones, aside from
material and finish quality, is that most of the good ones include
include a ridge to press in the auto-diaphragm pin on M42 lenses and
stop down the aperture. This is not important for Pentax M42 lenses
... all of them have an auto-manual diaphragm operation switch on the
lens ... but becomes important for various third party lenses which
lacked the A-M switch. If you don't have an A-M switch on the lens and
you don't have the adapter with the ridge in it, the lens will always
be at wide open aperture.
I had a couple of the originals and had one fitted to each lens I was
going to use, with a thread-locking fluid (temporary, not permanent)
on the threads to keep it there. I'd removed the locking catch for the
body so that each lens simply mounted and unmounted like a K-bayonet
lens.
--
Godfrey
godfreydigiorgi.posterous.com
On Tue, Sep 11, 2012 at 10:50 AM, 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
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