That's the same thing my Tokina ATX-PRO 28-70 f/2.8 was doing.
Any time I twisted the zoom ring down to the 28mm position it lost
contact internally & gave me the dreaded "--" for aperture & the camera
(K-3; K20D) would prompt for me to enter the focal length when I tried
to activate the shutter.
There's a worn contact somewhere inside the lens.
On 9/9/2015 5:43 PM, P.J. Alling wrote:
I did. The issue seems to be in the aperture mechanism of the lens.
Stress the lens and the A contact behaves as if the lens has been taken
off the A position. I suspect there's a ground lead in the mount that
has a hairline crack in it. I'd take it apart but my track record of
losing small parts when I do something like that is not good. On a
related note, if anyone would like a video ready Vivitar S1 35-70 f2.8,
(no click stops contentiously variable f stop), lens I accidentally
made, a few years ago, it's price is totally negotiable.
On 9/9/2015 5:42 PM, Paul Stenquist wrote:
Clean the contacts.
Paul via phone
On Sep 9, 2015, at 4:54 PM, P.J. Alling <[email protected]>
wrote:
So I've been noticing that the Vivitar 70-210mm will lose contact
with the K-5II more than once in a while. This wouldn't be bad,
except in P and M mode it's like hitting the green button, any
aperture or shutter settings are reset to base. I hadn't noticed
this before and I thought that there might be something going wrong
with the lens. It's really very annoying.
Then I thought, what if it's a problem with the K-5II? That would be
a bummer, but at least the Camera is still under warranty. So I
mounted the lens on the K20D and THE K20D WORKS ENTIRELY DIFFERENTLY!!!
The lens has probably always lost momentary communication with the
camera, but the K20D simply goes back to where it was, when contact
is resumed. The shutter and aperture don't reset. Why the hell
would Ricoh rewrite the the code to do this? It makes no particular
sense. This issue could surface with any A lens.
End of rant, you may now resume your regularly scheduled entertainment.
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achieve immortality through not dying.
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