Collin,
There is a K300/4 - big and heavy -not an M lens.
There is an M*300/4 - precursor to the A*300/4
and identical in design except for A setting.
There is no M300/4.
It's a K or an M* (if mushroom shaped).
Regards,  Bob S.

On Wed, Dec 18, 2013 at 2:26 PM, CollinB <coll...@brendemuehl.net> wrote:
>>> If you want a *new* Tamron adapter ...
>>>
>>> http://igorcamera.com/pentax.htm
>>
>>have you actually bought from that store? i'm curious whether i can trust
> their
>>ratings (for something other than the Adaptall); for example they define
> EX+ as
>>"Better than average, used not abused", which contrasts strongly with KEH's
>
>>"Exceptionally nice"
>
> I have met Igor and have also bought from him.  Got a LF lens in DB shutter
> to transfer to a Copal 3.
>
> My only question about his lens list is regarding the M300/4.
> I find nowhere else the M, as opposed to the M*.
> Yet some here have said they own one.  May be quite rare.  Boz does not list
> it.
>
>
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