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04-12-2009, 08:36 PM   #1
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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

04-13-2009, 01:51 AM   #2
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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
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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
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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
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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
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Does there exist an auto focus extension tube which supports SDM ?
05-16-2009, 09:34 PM   #7
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I got those. I would keep it as won't be easy to get it back.
05-16-2009, 10:21 PM   #8
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QuoteOriginally posted by Mike.P Quote
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
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QuoteOriginally posted by fs999 Quote
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!
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