Nikon Extension Tube with Full AFS Contacts

[Nasos Kosmas]

I see the lens is holding good resolution for close ups with an f 4 could be nice, how many mm is the distance added by TC14?
Frank thank you very much!

[Frank Fremerey]

The distance is a tad less than with the PK-13, roughly 23mm

[Bent Hjarbo]

I "had" this Kenko teleconverter, that was not in use.
Inspired by the work by Erik, I thought that I might convert it to an auto extension tube, it worked with the 300mm PF ED, so the signals to control the aperture was ok.
It was rather easy to get the optics out, had to use some bit grabber to get the F-mount of, but it came of and it should be possible to assemble again if one would want it.
Had a small accident with the ribbon cable, but managed to repair it.
Apart from telling the wrong aperture, it still thinks it is a x2 converter, everything seems to work.
The extension is larger than with the Nikon converter 41mm.
Picture taken with Df ISO3200 1/1000S f4

[Erik Lund]

Very nice


If you disconnect the 'last' pin you will restore full AF speed if you need that,,,

[Bent Hjarbo]

The last, is it to the left or right when looking at the F-mount?

[Andrew]

Re: Kenko tubes.

Rigidity of 12mm tube+lens is much, much better if you exchange female bayonet on the tube on original Nikon from ring probably 40 years old...
Strait forward job!

[Bent Hjarbo]

The Kenko tube is unfortunately made of plastic, but the bayonet mounts is metal.
The tube is 41mm, so no need to extend it

[Hugh_3170]

Has anyone heard if this rumour has materialised?

I for one hope that it does - hopefully with tubes with all metal barrels and bayonet mounts!

I have heard a rumour that Nikon will release two new extension tubes with contacts this year as part of the 100 year anniversary,,,

[Bent Hjarbo]

But Kenko actually makes a 3 piece set with AF-S functionality, I guess composite materials are used

[Erik Lund]

Last pin    is the last pin to get into contact so to speak    #10
https://nikonhacker.com/wiki/F-Mount
Canon has the same, there it's the two last pins tell the AF to slow down

[Erik Lund]

Has anyone heard if this rumour has materialised?

I for one hope that it does - hopefully with tubes with all metal barrels and bayonet mounts!

No, it's still a rumor 

[Bent Hjarbo]

Thanks for info, will try it

[Erik Lund]

I would recommend to do it in the rear of the converter/extension tube, take out one pin, as I recall it also works in the front, simply removing the metal contact pad, how I did it first with the 2x TC.


Then you can always mount the pin again