AF extension tubes

**Eaglerapids** · 09-22-2009, 07:50 PM

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Yes SylBer, set whatever aperture you want with the aperture ring in manual mode, push the green button and the camera will set the shutter speed.

bodhi08 · 10-06-2009, 05:09 PM

Someone is selling the Kenko N-AF Uniplus Tube 25 and he claims that the AF works.

Does anyone has experience with this tube set?
I want to confirm that AF really works.

cheers

creampuff · 10-06-2009, 08:19 PM

Yes the Kenko Pz-AF Uniplus Tube 25 extension tube allows full AF. Obviously the lens you mount has to have AF functionality.
In addition, it offers full aperture control from the camera body when used with an A series lens (A setting on the aperture ring), F series, FA series, DA series and DFA series lenses.

Terzof · 10-07-2009, 07:02 AM

Originally posted by creampuff

Here's a shot taken with the FA 50mm f/1.4 and the Kenko Pz-AF Uniplus Tube 25 extension tube. Dead easy to use.

This Kenko Uni Tube just a "Kenko TC 2x MC4 without optical thing" That make an AF Tube of 25mm.

I'm trying to collect about 6 pcs of TC PK-A to use as a 150mm Auto A Tube. Get 2 pcs now and wait for more. It's really hard to find.

Anyway, IMO, there is no need to use AF in Marco photography. I never believed that until the day I try 2x TC + 100/2.8 + Raynox 250.

jolepp · 12-24-2010, 05:52 PM

This *might* be what the OP is looking for:

Anillos extensores DELTA macro 13/21/31 para PENTAX bei eBay.de: Lentes y Filtros (endet 28.12.10 12:48:40 MEZ)

The advert is apparently in Spanish, but these apparently have electrical contacts and the text PKA/AF which might mean AutoFocus as usual or maybe not, someone that actually can Spanish might take a look?

RioRico · 12-25-2010, 03:43 PM

Originally posted by Terzof

Anyway, IMO, there is no need to use AF in Marco photography. I never believed that until the day I try 2x TC + 100/2.8 + Raynox 250.

Quite right. Using the DCR-250 in AF on my FA100-300 or F35-70 or DA18-55 can be rather disconcerting. What the AF system thinks is the subject might not be what *I* think is the subject. Hopefully a macro subject isn't running around fast enough that AF is needed -- and if it is, there's always CIF with a manual lens.

Auto FOCUS isn't necessary for macro shoots. Auto APERTURE sure is handy, especially with flash. So there's the trick of knocking the glass from an auto-aperture TC and using that as a smart extension tube. Alas, I have but one such TC and I'm not yet willing to de-glass it as it's fairly good (a Focal) and I'd rather sacrifice something cheaper. One of these days...

macTak · 12-25-2010, 03:58 PM

Originally posted by jolepp

This *might* be what the OP is looking for:

Anillos extensores DELTA macro 13/21/31 para PENTAX bei eBay.de: Lentes y Filtros (endet 28.12.10 12:48:40 MEZ)

The advert is apparently in Spanish, but these apparently have electrical contacts and the text PKA/AF which might mean AutoFocus as usual or maybe not, someone that actually can Spanish might take a look?

No, the screw drive slot is clearly not there where it should be on these--they are PK-A, but not AF.

By the way, this is an old thread.

NeverSatisfied · 12-25-2010, 05:21 PM

I saw those Foto-Tip tubes about a year ago, on Ebay, but didn't really want to spend the money at the time. There was a link to them from the LensTip site (I think it originates in Poland?) It looks like all the required contacts are there- they may not work for screw-drive but I wonder it they'd support SDM?

macTak · 12-25-2010, 06:00 PM

Originally posted by NeverSatisfied

I saw those Foto-Tip tubes about a year ago, on Ebay, but didn't really want to spend the money at the time. There was a link to them from the LensTip site (I think it originates in Poland?) It looks like all the required contacts are there- they may not work for screw-drive but I wonder it they'd support SDM?

I don't see any SDM contacts, (and they should be visibile in that auctions picture), so I don't think it supports SDM.

jolepp · 12-26-2010, 03:38 AM

Originally posted by macTak

...
By the way, this is an old thread.

It is, but I thought this would be in context here for the benefit of those looking something like these with forum or external search.

NeverSatisfied · 12-26-2010, 12:18 PM

Originally posted by macTak

By the way, this is an old thread.

And yet, a year later, nothing has changed with regard to TC availability for Pentax! Disappointing...

Ha! I meant "extension tubes", but the same still applies!

12-26-2010, 12:18 PM	#26
NeverSatisfied Veteran Member Join Date: Dec 2007 Location: S.E. Michigan Photos: Albums Posts: 688	Originally posted by macTak By the way, this is an old thread. And yet, a year later, nothing has changed with regard to TC availability for Pentax! Disappointing... Ha! I meant "extension tubes", but the same still applies! Last edited by NeverSatisfied; 12-26-2010 at 01:31 PM.

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09-22-2009, 07:50 PM	#16
Eaglerapids Site Supporter Join Date: Apr 2007 Location: Idaho,USA Photos: Gallery Posts: 1,619	Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Yes SylBer, set whatever aperture you want with the aperture ring in manual mode, push the green button and the camera will set the shutter speed.

10-06-2009, 05:09 PM	#17
bodhi08 Senior Member Join Date: Jan 2009 Location: Perth, Australia Photos: Gallery \| Albums Posts: 180	Someone is selling the Kenko N-AF Uniplus Tube 25 and he claims that the AF works. Does anyone has experience with this tube set? I want to confirm that AF really works. cheers

10-06-2009, 08:19 PM	#18
creampuff Veteran Member Join Date: May 2007 Location: Singapore Photos: Gallery Posts: 3,953	Yes the Kenko Pz-AF Uniplus Tube 25 extension tube allows full AF. Obviously the lens you mount has to have AF functionality. In addition, it offers full aperture control from the camera body when used with an A series lens (A setting on the aperture ring), F series, FA series, DA series and DFA series lenses.

10-07-2009, 07:02 AM	#19
Terzof Junior Member Join Date: Feb 2009 Location: Vietnam Posts: 45	Originally posted by creampuff Here's a shot taken with the FA 50mm f/1.4 and the Kenko Pz-AF Uniplus Tube 25 extension tube. Dead easy to use. This Kenko Uni Tube just a "Kenko TC 2x MC4 without optical thing" That make an AF Tube of 25mm. I'm trying to collect about 6 pcs of TC PK-A to use as a 150mm Auto A Tube. Get 2 pcs now and wait for more. It's really hard to find. Anyway, IMO, there is no need to use AF in Marco photography. I never believed that until the day I try 2x TC + 100/2.8 + Raynox 250.

12-24-2010, 05:52 PM	#20
jolepp Veteran Member Join Date: Oct 2010 Location: Finland Photos: Albums Posts: 3,196	This might be what the OP is looking for: Anillos extensores DELTA macro 13/21/31 para PENTAX bei eBay.de: Lentes y Filtros (endet 28.12.10 12:48:40 MEZ) The advert is apparently in Spanish, but these apparently have electrical contacts and the text PKA/AF which might mean AutoFocus as usual or maybe not, someone that actually can Spanish might take a look?

12-25-2010, 03:43 PM	#21
RioRico Veteran Member Join Date: Jun 2008 Location: Limbo, California Posts: 11,263	Originally posted by Terzof Anyway, IMO, there is no need to use AF in Marco photography. I never believed that until the day I try 2x TC + 100/2.8 + Raynox 250. Quite right. Using the DCR-250 in AF on my FA100-300 or F35-70 or DA18-55 can be rather disconcerting. What the AF system thinks is the subject might not be what I think is the subject. Hopefully a macro subject isn't running around fast enough that AF is needed -- and if it is, there's always CIF with a manual lens. Auto FOCUS isn't necessary for macro shoots. Auto APERTURE sure is handy, especially with flash. So there's the trick of knocking the glass from an auto-aperture TC and using that as a smart extension tube. Alas, I have but one such TC and I'm not yet willing to de-glass it as it's fairly good (a Focal) and I'd rather sacrifice something cheaper. One of these days...

12-25-2010, 03:58 PM	#22
macTak Veteran Member Join Date: Apr 2010 Photos: Gallery Posts: 759	Originally posted by jolepp This might be what the OP is looking for: Anillos extensores DELTA macro 13/21/31 para PENTAX bei eBay.de: Lentes y Filtros (endet 28.12.10 12:48:40 MEZ) The advert is apparently in Spanish, but these apparently have electrical contacts and the text PKA/AF which might mean AutoFocus as usual or maybe not, someone that actually can Spanish might take a look? No, the screw drive slot is clearly not there where it should be on these--they are PK-A, but not AF. By the way, this is an old thread.

12-25-2010, 05:21 PM	#23
NeverSatisfied Veteran Member Join Date: Dec 2007 Location: S.E. Michigan Photos: Albums Posts: 688	I saw those Foto-Tip tubes about a year ago, on Ebay, but didn't really want to spend the money at the time. There was a link to them from the LensTip site (I think it originates in Poland?) It looks like all the required contacts are there- they may not work for screw-drive but I wonder it they'd support SDM?

12-25-2010, 06:00 PM	#24
macTak Veteran Member Join Date: Apr 2010 Photos: Gallery Posts: 759	Originally posted by NeverSatisfied I saw those Foto-Tip tubes about a year ago, on Ebay, but didn't really want to spend the money at the time. There was a link to them from the LensTip site (I think it originates in Poland?) It looks like all the required contacts are there- they may not work for screw-drive but I wonder it they'd support SDM? I don't see any SDM contacts, (and they should be visibile in that auctions picture), so I don't think it supports SDM.

12-26-2010, 03:38 AM	#25
jolepp Veteran Member Join Date: Oct 2010 Location: Finland Photos: Albums Posts: 3,196	Originally posted by macTak ... By the way, this is an old thread. It is, but I thought this would be in context here for the benefit of those looking something like these with forum or external search.