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11-10-2009, 10:44 PM   #1
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Are extension tubes available for the K20D?

I have seen extension tube sets on ebay, but they do not allow any of the electronics to work. Does anyone make an extension tube set for the K20D that has electrical contacts so that all of the functions can be used?

11-10-2009, 10:52 PM   #2
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None that allow AF function. But an old TC can be converted to an A extension tube by gutting it...

Last edited by Ash; 11-10-2009 at 11:02 PM.
11-10-2009, 10:53 PM   #3
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11-12-2009, 03:22 AM   #4
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They are hard to find. In the Netherlands I know one shop that sells these extension tubes. They are original Pentax, and therefore expensive...

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11-17-2009, 05:49 PM   #5
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If you want to do macro, it is better to do manual.
Focusing manually is better too and AF is not very usable since at close focusing, it would be more of fine focusing.
Stopping down isn't so bad either for macro.
11-18-2009, 04:09 AM   #6
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No electronics, but I use a set of Pentax extension tubes from about 1960.
11-18-2009, 04:14 AM   #7
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Try to search Ebay for Jessops PKA tubes. They have all of the contacts, minus the AF connection (useless anyway with macro). I use them on my K20D regularly.
11-18-2009, 09:12 AM   #8
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It is actually kind of hard to find nowadays brand new second/third party accessories for Pentax since there are not a lot of Pentax users.
Second/Third party products won't even make them since Pentax doesn't even advertise and if nobody buys Pentax cameras, then nobody would buy their products too.
Unlike before when Pentax was a top player, most second/third party brands produced accessories for Pentax.
This is also the reason why you could mostly find second/third party accessories that are very dated. Even brands you no longer hear anymore, but as we see now known brand name (like Kenko for extension tubes) accessory producers don't even bother to make Pentax but make them for Nikon or Canon.
If you like a lot of accessories for your camera, then Pentax is not a way to go.
Even cheap ringflashes are extensively made and distributed only for Canon & Nikon by Tumax.
Pentax users are like southpaws or lefties..we always have to make do or find a way around a problem.

11-18-2009, 09:13 AM   #9
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I use the Vivitar AT-22.
No electronic contacts too from way back 1900 something..
11-18-2009, 02:18 PM   #10
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The best choice for close ups and macro is Catch-in-focus. I would recommend any set of tubes with contacts for exposure metering, but without the AF contacts. My one and only tube is 50mm without contacts for exposure, but since I use it only with my M lenses, It doesn't bother me. The contacts don't work anyway.
11-18-2009, 03:30 PM   #11

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QuoteOriginally posted by Ash Quote
None that allow AF function. But an old TC can be converted to an A extension tube by gutting it...
Here's one of my PKA extension tubes. It is just a gutted Vivitar 2X TC:

Here's a photo of my Tamron 1.4X TC, taken with a DA 40mm Ltd. at its closest focusing:

Here's a photo of the same Tamron TC, taken with the DA 40mm Ltd. coupled with the aforementioned extension tube. Note that the DA lens does not have an aperture ring, thus requires A contacts for aperture-control function.

All photos are resized only, no cropping.

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