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04-21-2015, 05:22 PM   #1
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Extension tubes with AF drive pass-through

I have the rare Kenko P/AF extension tube set (12mm/20mm/36mm) that passes through all the contacts but not the AF drive shaft or Pz contacts. I've come across a 20mm/36mm extension tube set that includes the AF screw drive and Pz contact pass through. Seems like that could be useful with AF macro lenses (to the extent that AF with macro can be useful). Anyone have any experience/thoughts?

04-21-2015, 05:28 PM   #2
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Those are quite rare. Usually we see folks buying a teleconverter and taking out the glass.

What brand are you seeing? There were some posts a few months ago about some new extension tubes being produced and offered for sale. Someone got a set but I think their experience was not very good.

---------- Post added 04-21-15 at 05:30 PM ----------

Here is the thread I was thinking of: https://www.pentaxforums.com/forums/16-pentax-news-rumors/264093-new-auto-ext...-q-mounts.html
04-21-2015, 05:46 PM   #3
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The ones made by Kooka have all the contacts and drive shaft. The reviews on these were mostly negative. Perhaps Kooka has solved their QA problems but I doubt it. There were others appearing on Amazon but it is unclear if they are Kooka rebranded or otherwise. No reviews on the PKAf tubes that I've seen. Take one for the team and try them out.
04-21-2015, 06:11 PM   #4
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I heard about them a year ago, maybe more and when I contacted them they was telling me that they are out of stock and they do not know when they will make them again, particularly for Pentax. I give up afterwords and anyway I find that manual focus macro lens is better suited to me.

Just my 2c.

04-21-2015, 07:22 PM   #5
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The ones I saw are Movo brand, turns out they are being sold by Movo on Amazon's marketplace, and there is only one very negative review - basically it damaged the person's camera! I find that rather remarkable (and disturbing):

Amazon.com: T. Hallen's review of Movo Photo AF Macro Extension Tube Set for...

I guess I should hold onto my Kenko set!
04-22-2015, 02:14 AM   #6
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The question at higher magnification is whether you want AF to start with as manual focus may well give better results, so whether such tubes exist may be a topic of conversation but not much more.

Where an extension tube is being used on a long telephoto lens to bring down the min. focus distance a bit, as others suggest a cheap teleconverter that allows the glass to be removed would allow screw drive tele lenses to be easily used. Cheap and Pz contacts seem to be mutually exclusive terms so not likely a solution for a SDM lens.
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