Nikon Extension Tube with Full AFS Contacts

[Akira]

Full AF and Aperture control?

The picture Akira just posted does not show the contact block.

Frank, you should see the teeny-weeny bit of the contact block on the camera mount side. 

[Frank Fremerey]

Akira. I found a listing at an online photo shop selling tge Kenko 1.4 for Nikon with the contact block visible.

[Bruno Schroder]

With the same idea in mind, I bought a AF Vivitar 1.4x and a AF Tamron 2x for cheap some time ago. They both have a 7 contacts block.

[Erik Lund]

do they support Nikkor-E lenses?

[Bjørn Rørslett]

About the ask the same: for such items to be eligible as candidates for "pass-through" extension, they need to preserve functionality of 'E' lenses. Plus the inner tube has to be wide enough so as not to cause vignetting.

Being robust and securing a sturdy connection to the camera is a given requirement as well.

[Akira]

The contact blocks of Bruno's TCs have seven contacts.  The new TCs by Kenko-Tokina that are compatible with G and E Nikkors (called TELEPLUS HD) have eight contatcts:

http://dc.watch.impress.co.jp/docs/news/1032981.html

(Frank, sorry, the image of the latest TCs can be found in the webpage linked above.  The previous link is for an older TC.)

However, the 300/4.0 FP has ten contacts.   

[Bjørn Rørslett]

.... However, the 300/4.0 FP has ten contacts.  ...

So has the TC-14E.2 that Erik used as material for the pass-through extension.

[chris dees]

Sorry for the somewhat late reply.
The Kenko I have is the Kenko Teleplus PRO 300 DGX 1.4x AF Teleconverter. The image is not 100% the same one as I have, but very similar. It has 8 pins on the other side.
IMHO it's not usable. AF is ok (on a D500) but IQ is lousy, but I tried only for a few images.
First one is at about 5m, the second about 25m. Both very soft and hazy (it's not the lens nor the camera )
I did not tried the converter with other lenses yet.
Bot images are cropped to about 1800px

@Bjørn - I take it with me the next time we meet

[Bjørn Rørslett]

'Not usable' is apparently an understatement ....

Besides, the internal opening is small and will cause vignetting for lenses with a large exit pupil.

[Bruno Schroder]

I don't have an E lens, so can't test but AF and metering do work fine with a 80-400 AF-S on a D750. The inner hole is 34mm on both the Vivitar and Tamron, without Dremeling. Increasing it would require touching the contact block.

[Kim Pilegaard]

Maybe I missed something, but what is wrong with the Kenko Auto Extension tubes - maybe too narrow?

[PedroS]

Maybe I missed something, but what is wrong with the Kenko Auto Extension tubes - maybe too narrow?

Don't think so, but the quality is marginal and there's movement when coupled with the lens.
Body is soft plastic and locking system is, again, marginal in quality.

I have used two of them to make a PB-5 all electronic connected, thought.

[Akira]

Don't think so, but the quality is marginal and there's movement when coupled with the lens.
Body is soft plastic and locking system is, again, marginal in quality.

Hope that problem is solved on the new models.

[Frank Fremerey]

Can you post a DIY guide on this operation? I am tempted to try my luck disassembling the 14E I got yesterday and making the extension tube myself

[Bjørn Rørslett]

That might turn out to be an expensive learning session.