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04-13-2009, 11:10 AM   #1
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kibipod's Avatar

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DA lens & extension tube

Which extension tube and / or modified teleconverter (optics removed) should work with a DA lens? How do I use it? Thanks in advance.

04-13-2009, 03:50 PM   #2
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The problem with using many of these with DA lenses is that there's no aperture ring so you're stuck shooting wide open. Many (most?) of the tubes lack electronic contacts so you're also stuck using stop-down metering (M mode/green button). I believe Kenko used to offer an AF-capable extension tube with electronic contacts but as far as I know these are discontinued and rather rare. I imagine there are others here who can make more specific recommendations.
04-17-2009, 11:35 AM   #3
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I found my set of extension tubes on Adorama. They have 7 contacts, so the DA lenses set aperture correctly. They don't communicate focal length for SR, so you have to set this information manually. I use them a lot with my smc P-FA 50mm F1.4 lens and have used them with the smc P-DA* 16-50mm F2.8 ED/AL (IF) SDM lens from time to time.

You can find them here: POAETPXK Pro Optic Auto Extension Tube Set for Pentax-KPR Mount, 3 Tubes.

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