Barry, few years ago I had Tamron 90/2.5 macro (older one) with PK-A
Adaptall adapter. It worked just fine only occasionally having electric
contact problems due to minute mechanical shift of a lens w.r.t.
adapter. I am thinking that you could find yourself another such adapter
(PK-A) on eBay or other venues that offer second hand gear and in
principle it might solve your problem.
I did not find this little issue anything more than a minor nuisance at
the time. Sold the lens only because I wanted to buy significantly more
expensive FA 31/1.8 Limited and had no money available...
Boris
On 12/28/2010 8:05 AM, Barry Rice wrote:
Hey Pentaxians
I do my macro work using a Tamron 90mm 1:1 F2.8 macro, which is a generic
lens that sits on a Pentax P/KA mount. Unfortunately, the lens is starting
to act erratically and I've figured out that it is because of the adaptall
mount.
Unfortunately, I've discovered that the Pentax adaptall mount for automatic
lenses are no longer being made, rumour has it they were unreliable,
although my mount lasted for about 12 years. The regular Pentax P/K mount is
useless for this lens (I know, I have one.)
I've seen references to some other kind of mount, M42 or something like
that. Can someone 'splain to me if this is something I can use to bring my
extremely cherished 90mm back to life? I think it is a generic mount that
needs some kind of Pentax add-on?
Cheers
Barry
Barry Rice, Ph.D.
Carnivorous Plant FAQ
sarracenia.com
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