Hi all,
I have some problems with the electrical communication between my Pentax
Super-A body and my Takumar zoom lens 28mm-80mm.
The lens has aperture range f22-f3.5/4.5, which is encoded by the Ka-mount
contacts 001*10 (see Boz's pages http://www.phred.org/pentax/k/) As you know,
in the above encoding '1' means metal contact and '0' means no metal contact,
or hole filled with plastic.
Now, due to some wear (and bad tolerances) to the locking mechanism that must
hold the lens precisely in position, the lens can still rotate a tiny bit with
the locking pin in place. And, you guessed it, this seems to be just enough to
allow some of the "r" contacts to contact metal and to make the body think that
the lens a larger aperture range (e.g. decoding 111*11, which would mean
aperture f22-f1.2 and 'adjusting' speed accordingly).
So I am thinking of of unmounting the ring with the contacts on the lens, and
enlarging the holes of the "r" contacts, to make sure the body always decodes
001*10. Has anybody already done this? Any practical advise on how to do
this?
Should I try to narrow the hole for the locking pin instead? This seems to be
really difficult, in my opinion... Any tricks in that respect?
Thanks in advance for all your good advice! And thanks also to Boz, his page
was really very helpful to understand the problem!
Johan.
P.S. Some time ago I already did a search on this topic on the net, and
found a post to PDML that described the same problem. With Altavista I
can still find following trace of that post, but I don't know where to
find the old archives of PDML on the net... Any help here?
* Pentax-Discuss Archive: Re: problem with Super A and SMC-A 50mm Re: problem
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