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10-06-2009, 06:26 AM   #1
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Macro Extension Tube Set 13/21/31 mm Rings for PENTAX

Hello fellow Pentaxians

I have been looking for extension tubes that has electrical contacts that allow AF and auto aperture. I've heard there is only one i.e. Kenko Uniplus AF Extension Tube 25 Pz-AF. I have never seen it on the market.

There is an ebay reseller that is selling this:
Macro Extension Tube Set 13/21/31 Rings for PENTAX
Item number: 110432390147

Is there anyone that has experience with this tube set?

I am really curious if the AF really works and if it works with slow lenses in low light.


cheers


Last edited by bodhi08; 10-06-2009 at 04:24 PM.
10-06-2009, 07:46 AM   #2
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Those are not AF capable extensions.
Using them with a slow lens in low light, would be very hard. They cut the amount of light hitting the sensor.
10-06-2009, 05:08 PM   #3
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Thanks for replying wildlifephotog

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
10-07-2009, 06:43 AM   #4
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Yes it is auto focus. And it will work as long as the camera has enough light to focus.
Real low light will stop almost any AF system.

10-08-2009, 04:09 PM   #5
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If you are doing macro anyway, AF is of little help.
MF is better as you can fine tune the focusing.
10-08-2009, 04:11 PM   #6
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I would say that something that has a contact or control of the aperture is sufficient.
If I had to stop down every time I shoot, then I would take too much time.
10-10-2009, 09:12 AM   #7
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Thanks wildlifephotog and GerryL

It seems that I learn something new every week from this forum.
10-10-2009, 09:36 AM   #8
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There are also the Vivitar Ext/Tubes "AT-23" AF, rare, but I found mine on eekbay.

Carefull, they also made the AT-22 which does'nt have the AF contacts.

10-16-2009, 09:32 AM   #9
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QuoteOriginally posted by wwwmorrell Quote
There are also the Vivitar Ext/Tubes "AT-23" AF, rare, but I found mine on eekbay.

Carefull, they also made the AT-22 which does'nt have the AF contacts.
I have the AT-22 and they work quite well 'coz it has the diaphragm "thingy" wherein you can stop down easily like using a manual "K" lens.
All you lose is the AF and the auto aperture control or the "A" setting.
They work great!
What you should avoid are the ones that don't even have the aperture or diaphragm levers.
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