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Mainly for members located in the EU:

There is a PK-A extension tube set on eBay.
Of course the auction could still end up at a creazy high price, as usual for this item,
the more as it ends on Sunday evening.

I already got such a part, and luckily quite cheap.
This was because the seller had not mentioned the contacts, and the pictures did not show them quite well.

Jessop Auto extension Tubes For Pentax KA | eBay

[ZombieArmy]

Wish there were modern PK-A tube options. Thanks for the heads up.

[ramseybuckeye]

In Japan . . .
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[stevebrot]

In Japan . . .
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Interesting...there is a download link for lens and accessories catalog with listings for all kinds of cool stuff like the Refconverter A that have not been available on this side of the ocean for some time (decades?).

Do you think those extension tubes are auto with A contacts? The appearance is similar to the Pentax Extension Tube K which had no aperture coupling.

PENTAX Manual Extension Tube Set K reviews - Pentax Camera Accessory Review Database


Steve