Nikon to Pentax K adapter

Started Apr 18, 2013 | Discussions
emem
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Nikon to Pentax K adapter
Apr 18, 2013

Does anyone use such a thing? If so what make and how good is it in practical terms? Can you use AF or is it purely manual? I have some nice Nikon lenses and would love to use them on my K-5.

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Mike M. (emem)
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Pentax K-5
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Simon Devlin
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Re: Nikon to Pentax K adapter
In reply to emem, Apr 18, 2013

I've never heard of this marriage and if you could do, AF would never ever be compatible in a zillion years.

You could try duct tape.

Look up the web although I have never heard of it.

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Simon
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smafdy
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Re: Nikon to Pentax K adapter
In reply to emem, Apr 18, 2013

I wondered the same thing when I bought my Pentax bodies. I don't think the Pentax mount is adaptable to the optics of other manufacturer's glass. I think it has something to do with the mount to sensor distance, although I'm not absolutely sure of it. It does seem to me that if an adapter was possible, someone would be manufacturing it.

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altis
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Re: Nikon to Pentax K adapter
In reply to emem, Apr 18, 2013
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steephill
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Ask Ron (brandx)
In reply to emem, Apr 18, 2013

A manual focus adaptor exists but it has a correction element built in because of the registration distance issue. This means it is also a teleconverter. AF is not available.

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Steve
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brandrx
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Re: Ask Ron (brandx)
In reply to steephill, Apr 18, 2013

steephill wrote:

A manual focus adaptor exists but it has a correction element built in because of the registration distance issue. This means it is also a teleconverter. AF is not available.

You can go either way, Pentax to Nikon or Nikon to Pentax. In order to focus to infinity you need to have the glass corrective elements. It will provide a teleconverter effect of about 1.25 to 1.3X. You can get them without the glass corrective elements also but you lose infinity focus. These things are cheap enough that it is worth a try IMO. I don't remember which one that I bought. I think they are all pretty much the same thing. The one with the glass corrective elements work best with very good lenses.

Nikon PK adapter

I bought one with and one without the glass corrective elements to use with a Nikon 400mm f2.8 AI-S manual focusing lens. Without the glass corrective elements It will only focus to about 100 feet.  However, I did find out that my Nikon 400mm f2.8 + Nikon TC-301 2X teleconverter will focus to infinity with a Nikon-PK adapter that does not have the glass corrective elements. With a Nikon 1.4X TC it will focus to about 400 feet. With a Nikon TC16A 1.6X AF Adapter (set to it's infinity position) it will focus to about 600 to 700 feet. With the glass corective elements Nikon-PK adapter I do have a loos of IQ but not too much IMO. It is still very usable. I also use it with my Pentax 1.7X AF Adapter to make for a 400mm times 1.3X times 1.7X (884mm) autofocusing lens.

Forum member Ari Aikomus modified a Pentax K-mount Kenko 1.5X teleconverter to take a Nikon lens on the lens mount side

Cheers.

Ron

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Ron - 'We don't have time to go take pics this afternoon Carl.'
Carl - 'What do you mean? It will only take 1/1000s.'
'Keep your eyes looking forward. However, glance back now and then to see where you've come from. It will put a smile on your face.' ~ brandrx

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emem
emem OP
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Re: Ask Ron (brandx)
In reply to brandrx, Apr 18, 2013

Thanks for the detailed response Ron - appreciate it. I did find a Nikon-PK adapter online after I started this thread which allows you to remove the glass element. Not sure how that will work but I might give it a try.

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Mike M. (emem)
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brandrx
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Re: Ask Ron (brandx)
In reply to emem, Apr 18, 2013

emem wrote:

Thanks for the detailed response Ron - appreciate it. I did find a Nikon-PK adapter online after I started this thread which allows you to remove the glass element. Not sure how that will work but I might give it a try.

I did the same thing with my original one that I bought. However, when I wanted to screw it (the elements) back in I had a problem keeping them (there are two lens elements) clean. I found it was less hassle to just buy one with glass elements and one without glass elements.

EDIT: Also take not that without the glass elements you cannot focus to infinity. My 400/2.8 will focus to about 100 feet. I remember trying it with a Nikon 200mm macro and I think it would only focus to about 10 feet. So, even shorter focal length lenses will have even shorter maximum focusing distances when used with a glassless adapter. I always wanted to try a glassless adapter with a Nikon 800mm f5.6 just to see hor far I could focus but I didn't want to spend over $3000 just to do that test.

Cheers.

Ron

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Ron - 'We don't have time to go take pics this afternoon Carl.'
Carl - 'What do you mean? It will only take 1/1000s.'
'Keep your eyes looking forward. However, glance back now and then to see where you've come from. It will put a smile on your face.' ~ brandrx

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Petroglyph
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Re: Photodiox probably makes one.
In reply to emem, Apr 20, 2013

I tried one going the other way.  To mount an old PK/A 50mm f/2 manual lens on a Nikon D60 (CCD sensor also old tech).  It actually worked fine in completely manual mode and can focus at infinity.  I thought the fit was a little wobbly so I wouldn't use it until they come out with a pro-grade model.  I haven't checked in over a year if they have or not.  It is fun experimenting with things such as that.

Regards.

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photoholiko
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Re: Nikon to Pentax K adapter
In reply to emem, Apr 21, 2013

I just acquired a Canon FD to PK adapter and I already have one for Nikon lenses, they both have glass elements but the FD one doesn't allow me to focus to infinity, the one for Nikon does. I have used different brand lenses with both adapters and found the results from FD lenses are not impressive on the Pentax while they do well on other cameras, howerver the Nikon mount lens do great.

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