[nparsons13]

This morning I did some shooting with the K-01 + PK+MM mount and my Nikkor-P 105mm f/2.5. This is the first time I've been able to take my time with the Nikkor and get used to it. I think it has distinct possibilities.

[nparsons13]

Here's the Nikkor-P on the K-01. It's a nice fit after the lens mount is shimmed out about 1mm so that the mount clears the rim formed by the aperture ring.

[K David]

Here's the Nikkor-P on the K-01.

Aesthetically, that looks great on the K-01.

[Gnarelsek]

Yes, some Nikon glass do look good on that mirrorless K-01. Looking forward to see more adapted lenses.

[UncleVanya]

There is a lot of into here can someone summarize for me the following:

If I put one of these alternate mounts on my pentax K100D Super (as an example) and then mount a Nikon AI series lens (let's say the 50 f/2 for simplicity) will I be able to use the lens like an M series Pentax with on demand stop down metering by button or will this be more like an M42 with the lever at the M position (aperture closes to whatever it is set for all the time).

[nparsons13]

They work like M42 lenses with the aperture switch set on M. There is no way for a Pentax camera to communicate aperture information with a Nikon, Yashica/Contax, Olympus, Konica, or 4/3 lens. The levers and/or contacts that transmit that information are different in each these camera makes. So the aperture on any of those lenses must be set manually when used with a Pentax body equipped with the PK+MM.

On the K-01, for example, with auto ISO and the camera set to P, Av, Tv, or M mode, you get TAv mode. With manual ISO and the camera set to P, Av, or Tv, you get Av mode only, but when you set the mode dial to M you get full manual exposure and use of the green button to set exposure (if your camera is set up for it).

Manual stop-down is default for Nikon, Yashica/Contax, and Konica lenses, but Olympus OM lenses can be stopped down manually only when the lens is attached to an OM camera or when the auto-aperture mechanism is disabled--as by putting a piece of tape over the stop-down button on the base of the lens. I don't know about 4/3; the Adaptist website has advice about using them.

[UncleVanya]

They work like M42 lenses with the aperture switch set on M. There is no way for a Pentax camera to communicate aperture information with a Nikon, Yashica/Contax, Olympus, Konica, or M43 lens. The levers and/or contacts that transmit that information are different in each these camera makes. So the aperture on any of those lenses must be set manually when used with a Pentax body equipped with the PK+MM.

On the K-01, for example, with auto ISO and the camera set to P, Av, Tv, or M mode, you get TAv mode. With manual ISO and the camera set to P, Av, or Tv, you get Av mode only, but when you set the mode dial to M you get full manual exposure and use of the green button to set exposure (if your camera is set up for it).

Manual stop-down is default for Nikon, Yashica/Contax, and Konica lenses, but Olympus OM lenses can be stopped down manually only when the lens is attached to an OM camera or when the auto-aperture mechanism is disabled--as by putting a piece of tape over the stop-down button on the base of the lens. I don't know about micro 4/3; the Adaptist website has advice about using them.

I think I have this but let's make sure:

If I mounted a 50mm f/2 Nikkor on my Pentax K100D Super with the PK+MM mount, I would likely keep the lens aperture set to maximum to keep the display bright and then if I wanted a different aperture and proper exposure I could simply set it in Av mode - focus and then when I wanted a narrower f/stop turn the aperture and the metering would see the darker transmission and set the shutter speed accordingly.

[K David]

If I mounted a 50mm f/2 Nikkor on my Pentax K100D Super with the PK+MM mount, I would likely keep the lens aperture set to maximum to keep the display bright and then if I wanted a different aperture and proper exposure I could simply set it in Av mode - focus and then when I wanted a narrower f/stop turn the aperture and the metering would see the darker transmission and set the shutter speed accordingly.

Yup.

[nparsons13]

Yup.

I second the yup.

[nparsons13]

Closeup with a Konica Hexanon AR 135mm f/3.2. I wasn't real happy with the focus on this shot, but apparently other people like it.

[Scintilla]

Just got my PK+MM (Wide Receiver Weather Resistant version for my K-30) the other day, then promptly ran some tests yesterday infinity focusing from my office's parking garage with my M 28/3.5 versus a Carl Zeiss Distagon 28/2.8 (for Contax/Yashica) that I picked up for just over $200 (which was the reason I got the PK+MM in the first place).


Both at f/4 and at f/8, at anywhere other than frame center, the Zeiss beat my M convincingly (as in I could tell the difference even viewing at 1546x1024). I just hope it's because the Distagon is just that good, or maybe because my M 28/3.5 has field curvature like my DA 21, and not a sign that installing the PK+MM might have left my K-mount lenses unable to focus to infinity...


(I could barely budge the K-30's original mount after removing the screws, until the whole thing just popped off suddenly and very much not "slowly" as the instructions instruct, so I'm really hoping I did not screw things up somehow. I need to test some other Pentax lenses to make sure -- not the Rokinon, because as much as I love the way the world looks through the OVF when that lens is on, we all know those lenses often go past infinity.)

[RockvilleBob]

Pentax K3 with Olympus 50mm Zuiko Macro lens with Leitax adapter