
http://www.ricoh-imaging.co.jp/japan/products/lens/k/converter/lc-1_4x-aw/
The official on-sales date in the Japanese home-market will be March 7th. A full list of compatible Pentax K-mount digial lenses is provided, note that not every DA lens of Pentax/Ricoh is compatible.
Besides, it does look very familiar for its appearance specs including the physical parameters, many things are just too close to my ancient "Tamron" Pz (Power Zoom) TC 1.4X Model MC-4 that I purchased 14 years ago, which is yet believed to be original manufactured by Kenko!
For more information of the Tamron 1.4X MC4, look here:
http://www.ebay.co.uk/itm/Tamron-F-AF-Tele-Converter-1-4X-Pz-AF-MC4-with-box-and-papers-/121171067435

Well, even the lens release lever looks exactly the same, what a "co-incidence"! :-o ;-)
But I just wonder, why it takes so long for Pentax to release such an OEM product, if it really is, which has been delayed for so many years since it was first announced back to 2008!?!
Nonetheless, my prolonged experience for that adapter is that it is great for APS-C cropped image circle but is just fair to rather mediocre optically when it works with Full Frame, no matter film or digial. Enough said! :-(
BTW, for real photo samples for how the "Tamron" 1.4X MC4 performs optically, here you will find some samples of mine:
K-5D Mark III: DA 18-55 II Converted to a 24-80 FULL FRAME Lens!
Mike Lambert · 578 weeks ago
asdadasaz · 578 weeks ago
Aspa · 578 weeks ago
You absolutely right: both converters used 7 external contacts and two inside the mount. And all the contacts are exactly in the same position in Pentax and Tamron!!! Well, AF motor screw is identical, both construction are circular and dark in color. So, if you cool down a little and take a look again you might realize that lens release lever is different in shape but only slightly - anyway position of it in both converters are precisely the same!!!
Well, you right - Ricoh should be more original and built a triangle-shape converter with 27 contacts and no glass at all... This is only way to be sure that Rice will accept a product...
zosX · 578 weeks ago
Dan Johnson · 577 weeks ago
pfools · 576 weeks ago
Mike Lambert · 576 weeks ago
I have decided that Ricoh/Pentax are bonkers. I will use all my Pentax glass on my Fuji. If Pentax come out with a FF in the summer then great, otherwise thats it for me.
jaad75 · 576 weeks ago