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03-14-2015, 01:52 PM   #1
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Cannot manual focus with extension tubes...

Newbie to macro extension tubes!

I just received a set of Pentax macro extension tubes, these are they: PENTAX Auto Extension Tube Set K reviews - Pentax Camera Accessory Review Database. Regardless of what lens I mount on the tubes, I cannot get any of them to focus. I've set my K-5iis to both Manual and Tav with no luck. Additionally, I was under the impression that I could use my SMC A lenses in the A setting and control aperture from the camera with these - which I cannot. I was under the impression this is why they are the "auto" version.

Any suggestion would be most appreciated!


03-14-2015, 01:59 PM   #2
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The "auto" refers to the aperture diaphragm rather than the A contacts. You will need to put the camera in M mode, focus manually, and stop-down meter as you would with a manual lens:

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03-14-2015, 02:04 PM   #3
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Original Poster

Thank you Adam.
This was helpful.

03-14-2015, 03:53 PM   #4

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The word "auto" on any older equipment means "mechanically auto" -- moving the aperture lever or pushing a pin -- and even that isn't enabled on modern bodies. Modern equipment never says "auto" because electronic connection is assumed. So ironically now "auto" means "manual".

03-14-2015, 07:32 PM   #5
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Remember that your lenses will not focus to infinity with extension tubes. Probably something you and everyone else already knows but worth a mention in case.
03-15-2015, 05:20 AM   #6
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The other thing you may not get, if the lens mounts are painted black or anodzied , is focus confirmation. You need the lens contacts on the camera body shorted to get focus confirmation

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