HD Pentax-DA 645 90-180mm or 80-160mm f/4.5ED AW SR lens patent filed in Japan


A new patent for a Pentax DA 645 80-160mm f/4.5 lens (four examples in the patent application) or a 90-180mm f/4.5 lens (two examples) was filed by Ricoh in Japan. The lens is stabilized (just like the 90mm macro).


This patent is probably for the lens mentioned in the latest Pentax 645 lens roadmap as a “Tele Zoom” and if released, it will probably be called HD Pentax-DA 645 90-180mm or 80-160mm f/4.5ED AW SR.

Via forumpentax.fr

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  • Zos Xavius

    Well, that’s encouraging.

    • ZMWT

      I don’t know if that’s encouraging. Nikon D850, with a great lens, can deliver at least 85% of the IQ what 645Z and GFX can, and an order of magnitude more, because it beats any MF camera in all other respects of usability, speed, AF, versatility, you name it. Digital MF that uses 33×44 sensors, is a waste of time. GFX, 645Z and Leica S, are all heavily handicapped, slow cameras developed by underdogs and today a total waste of time and money. It would require Nikon to develop a proper, fast, usable, MF camera, and show these underdogs how things are done.

      • aaa

        Well yea, we know what Nikon D850 is and what it is capable of, but can I put my pentax lens on a nikon? No. Can I put a nikon lens on my pentax camera? No. So why would I care what nikon is doing? It’s like you being a nikon user, somebody give you a pentax/canon/sony camera, but you cant mount any of your lens on that camera, so that camera is irrelevant to you.

        I can understand it if somebody provoked you or belittled nikon first, and you feel like you want to defend nikon. But nobody said anything about nikon, and it’s not even a nikon forum. I really don’t understand why you feel the necessity to jump in and give a monologue about nikon.

      • Greg Timms

        I imagine Zos means that it’s encouraging that Ricoh are still designing lenses. We Pentax users are in an information drought; thristy for new developments

  • Mistral75

    Note that the lens is a DA 645, not a DFA 645: its image circle (diameter: 55.5mm according to the patent application) covers only a 33x44mm sensor.

    • El Aura

      Is this the case for all variants mentioned in the patent?

      • Mistral75

        Yes. There are six examples in the patent application, as described above. For any and all of them, “Y = 27.75” is clearly stipulated. The so-called Y is the radius of the image circle, expressed in millimetres.

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