Now I'm worried. I picked up my Vivitar 18-28 PK-A mount from the repair
shop last week. The front part was a tad loose and they tighten it back up.
Now looking through the back of the lens and moving the F stops, the
aperture stays the same. When I push the small protruding lever with my
finger, it opens. I tried it both on my ZX-M and MZ-10 and moved the
F-stops, and the meter responds as it should. Is the meter fooling me (I
haven't had a chance to run a roll of film throught) or is the camera
controlling the F-stops properly?
thnx - Martin
--- [EMAIL PROTECTED] wrote:
> Skip,
>
> Last year I bought a Kiron 105/2.8 1:1 macro lens from a mail-order
> dealer.
> It was advertised to be in EX condition. When I tested it mechanically, I
> found it to have the exact problem that you have! I took it to my local
> dealer, an extremely knowedgeable camera buff. He advised me that the
> spring that is supposed to close the diaphgram is either missing, out of
> place, or weakened. He added, "Send it back. If the dealer is any good at
> all, he'll fix or replace it."
>
> Sure enough, the dealer was extremely apologetic. All used lenses are
> supposed to be tested, he explained, but this one somehow must have
> slipped
> through the cracks. One month later, it arrived, repaired.
>
> It probably helped that I first emailed him in a tone that did not put him
> on the defensive. Since it worked so well for me, here is my letter for
> one
> and all; the subject line read, "Kiron PK Macro: Diaphragm Problem":
>
> "I'm afraid there's a problem with the Kiron PK 100/2.8 macro that I
> picked
> up from my Post Office last Tuesday (Nov. 21): The diaphgram won't close;
> it stays fully open, both on the camera and off. My local dealer examined
> it and believes the diaphgram spring is missing or loose. He added that
> this could not be a result of an impact (recent or otherwise), because
> there are no scratches or dents anywhere.
>
> "I discovered the stuck diaphgram over the holiday weekend, when I removed
> the lens from the SLR and looked through the rear element while rotating
> the aperture ring. On the camera, the lens correctly tells the camera what
> aperture it "should" be set at; the shutter speed changes accordingly.
>
> "I assure you my SLR with the lens on it was cradled in my padded
> camera/lens case until then.
>
> "I would like to return the lens. Where do we go from here?"
>
>
> --------------------------------
> PS to Pentax discussion list: Quality control wasn't this dealer's only
> deficiency. After instructing him--and later reminding him--to send the
> lens to my work address or I'd be dead meat, he sent it to my home
> address.
> Lucky for him, I was able to intercept it at the Post Office. Then, after
> repairing the lens, his "shipping department" sent it again to my home. At
> least that time I could honestly tell my wife it was a repair job.
>
> Paul Franklin Stregevsky
> [EMAIL PROTECTED]
>
>
> -
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>
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