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uloo · 04-12-2009, 08:36 PM

I have a Kenko autofocus Extension tube that has the PZ-AF contacts.
I also have the sigma 105 mm macro lens.
Since I got the Sigma macro lens I never use the extension tube anymore.
So I'm in a dilema ....

Should I keep it since its a rare find , or sell it to finance a lense I really would use ?

Whats the worth of an extension tube like that anyway ?

Would it work with the new SDM pentax lenses ?

Thanks
Ulrich

Damn Brit · 04-13-2009, 01:51 AM

Hi Ulrich, I would keep the extension tubes if I were you. As you become more proficient and acquire more lenses you will want to experiment with them. You can even use them
on your Sigma 105 mm macro.

If you want to judge their worth, search on ebay.

Welcome to the forum.

Mike.P® · 04-13-2009, 05:13 AM

I would sell the tubes as really and truly who would use autofocus when using them anyway, working that close would need manual I would have thought.

Personally I never use AF when doing macro.

Entropy · 04-13-2009, 09:37 AM

Keep in mind that the AF tubes also do auto aperture, and auto aperture in tubes is also quite rare.

ivoire · 04-13-2009, 08:26 PM

I also have one of these. I rarely use it, but I'm keeping mine. It does come in handy from time to time. the af and auto aperature is a plus

**fs999** · 05-15-2009, 03:34 PM

Does there exist an auto focus extension tube which supports SDM ?

dsport · 05-16-2009, 09:34 PM

I got those. I would keep it as won't be easy to get it back.

Damn Brit · 05-16-2009, 10:21 PM

Originally posted by Mike.P®

I would sell the tubes as really and truly who would use autofocus when using them anyway, working that close would need manual I would have thought.

Personally I never use AF when doing macro.

You don't need to AF with them, they're still extension tubes.

farfisa · 05-18-2009, 09:27 AM

Originally posted by fs999

Does there exist an auto focus extension tube which supports SDM ?

Apparently the Kenko Uniplus tubes support SDM.

Never tried them though--I had some earlier Kenko "AF" extension tubes and SDM didn't get along with them at all. Not only did they not AF (with any lenses--just made the screw drive spin loudly when I forgot to switch to MF), for some reason when I tried to use them with an SDM lens, live view didn't work on the K20.

I took them back because I paid full retail and they were pretty expensive. I'd still like to get a cheap tube with auto aperture though!

04-12-2009, 08:36 PM	#1
uloo Junior Member Join Date: Sep 2007 Location: Kentucky, USA Photos: Gallery Posts: 27	Auto focus Extention tube question. I have a Kenko autofocus Extension tube that has the PZ-AF contacts. I also have the sigma 105 mm macro lens. Since I got the Sigma macro lens I never use the extension tube anymore. So I'm in a dilema .... Should I keep it since its a rare find , or sell it to finance a lense I really would use ? Whats the worth of an extension tube like that anyway ? Would it work with the new SDM pentax lenses ? Thanks Ulrich

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04-13-2009, 01:51 AM	#2
Damn Brit Guest	Hi Ulrich, I would keep the extension tubes if I were you. As you become more proficient and acquire more lenses you will want to experiment with them. You can even use them on your Sigma 105 mm macro. If you want to judge their worth, search on ebay. Welcome to the forum.

04-13-2009, 05:13 AM	#3
Mike.P® Veteran Member Join Date: Mar 2008 Location: New Milton, Hampshire, UK Photos: Gallery \| Albums Posts: 2,154	I would sell the tubes as really and truly who would use autofocus when using them anyway, working that close would need manual I would have thought. Personally I never use AF when doing macro.

04-13-2009, 09:37 AM	#4
Entropy Veteran Member Join Date: Jun 2007 Location: Owego, NY Posts: 976	Keep in mind that the AF tubes also do auto aperture, and auto aperture in tubes is also quite rare.

04-13-2009, 08:26 PM	#5
ivoire Veteran Member Join Date: Mar 2007 Photos: Gallery Posts: 3,381	I also have one of these. I rarely use it, but I'm keeping mine. It does come in handy from time to time. the af and auto aperature is a plus

05-15-2009, 03:34 PM	#6
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,648	Does there exist an auto focus extension tube which supports SDM ?

05-16-2009, 09:34 PM	#7
dsport Veteran Member Join Date: Jul 2007 Location: Hong Kong Photos: Gallery Posts: 431	I got those. I would keep it as won't be easy to get it back.

05-16-2009, 10:21 PM	#8
Damn Brit Guest	Originally posted by Mike.P® I would sell the tubes as really and truly who would use autofocus when using them anyway, working that close would need manual I would have thought. Personally I never use AF when doing macro. You don't need to AF with them, they're still extension tubes.

05-18-2009, 09:27 AM	#9
farfisa Veteran Member Join Date: Nov 2008 Location: Toronto, Canada Photos: Gallery Posts: 1,274	Originally posted by fs999 Does there exist an auto focus extension tube which supports SDM ? Apparently the Kenko Uniplus tubes support SDM. Never tried them though--I had some earlier Kenko "AF" extension tubes and SDM didn't get along with them at all. Not only did they not AF (with any lenses--just made the screw drive spin loudly when I forgot to switch to MF), for some reason when I tried to use them with an SDM lens, live view didn't work on the K20. I took them back because I paid full retail and they were pretty expensive. I'd still like to get a cheap tube with auto aperture though!

Auto focus Extention tube question.

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