Just tried this, and I'm seeing the same thing too, with an A28/2.8
I'm guessing the camera refuses to stop down at all if it thinks there is no
lens present. The vivitar extension tubes are black on the mount (well,
mine are anyway) and I'm guessing non-conductive?
The alfoil trick on the contacts does seem to make it work as intended. I'm
now tempted to sand the paint off that part of the mount on my tubes.
- Peter
-----Original Message-----
From: John Francis
Sent: Wednesday, May 16, 2012 2:13 PM
To: [email protected]
Subject: Problems with K-5 and extension tubes
I've run into a problem trying to use my (Vivitar) auto extension
tubes with my K-5.
Scenarion: Camera set to "M", lens (A 50/f1.4) set to f/22.
With the lens directly mounted to the camera, everything works as
expected: DOF preview stops the lens down to f/22, and the exposure
check showshow far I am off from correct exposure. Taking theshoot
results in an image correctly exposed at f/22.
If I put one of the extension tubes in place, though, the lens
stays wide open at all times, and the image is captured at f/1.4
[no other changes to the settings on either lthe lens or the body]
This is not what I expect (or want). Any clue as to what is wrong?
Fortunately I have a work-around; using the Fotodiox K-mount-to-m43
adapter (and the same lens & extension tubes) on the Olympus E-PL1.
Here's what I was trying to photograph:
http://www.jfwaf.com/temp/pfsmini1.jpg
That's a small metal figure a friend of ours painted for my wife to
use when we participate in tabletop role-playing games (Pathfinder).
For a size reference, the large knurled circular plinth at the very
bottom of the shot is a metal K-mount body cap.
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Version: 2012.0.2176 / Virus Database: 2425/5001 - Release Date: 05/15/12
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