Tanya - someone who knows what they are talking about can answer this better
than I can, but the basic principle is that any K, M, A, F or FA lens will
fit on any K, Ka, or Kaf mount. No exceptions. (Of course all camera + lens
functions won't work the same, depends on how you mix lens and cameras of
different generations. But the lens will mount and it will be usable if it
is a good lens.) If the lens won't mount, it is either something wrong with
the lens or with the mount. If you are easily mounting/dismounting other
lenses, then it is a lens problem.

Now there may be a trick with the particular lens. Or it may be something
silly like a loose screw in the base of the lens mount which is catching on
the mount. Or the lens may be damaged.

I would suggest opening and closing the aperture a few times (i.e., work the
f/stop ring), work the aperture control level a few times, see if anything
is obviously loose or of different appearance from your other lenses. I
would also suggest saving the packing material the lens came in and consider
sending it back. Or send it to Paul Stregevsky. He should have had the good
sense to outbid you in the first place and thereby save you from yourself.

Good luck.

Stan

> From: "Tanya & Russell Mayer" <[EMAIL PROTECTED]>
> Reply-To: [EMAIL PROTECTED]
> Date: Fri, 6 Apr 2001 04:00:06 +1000
> To: "Pentax Discussion List" <[EMAIL PROTECTED]>
> Subject: Vivitar Series 1 28mm/f2
> 
> Ok, so this is the "other topic" I wanted to post about...Today (well,
> actually yesterday, it is after 3 in the morning here now, this list is
> worse for sleep deprivation than either of my babies ever were!), I received
> my Vivitar Series 1 28mm/f2 (yet another Ebay acquisition).  This is the one
> that Paul Stregevsky was so eager to talk me out of during bidding so that
> he could add it to his collection.  However, I am betting he is glad that I
> couldn't be dissuaded now, 'cause guess what? The bloody thing won't work!!
> As you all know, I now have a Pz-20 and an MZ-50.  At first, I was thinking
> that the problem was with the "crippled mount" of the MZ-50, but the same
> thing applies to the PZ-20.  When I line up the red dots and go to turn the
> lens to "click" it into place, it won't budge.  It just sits there and will
> not "attach" properly.  Although advertised as a "PKA" mount, it says on it
> that it is a "PK" mount and I am wondering if this has anything to do with
> it.  Do any of you guys own this lens? Have any experience with it? Had any
> problems with it?  I am really quite concerned as I also have another
> Vivitar Series 1 lens (28-90/2.8-3.5 macro) and what if this is the same?!?
> (Actually, I have a 7 day "inspection" period for that one cause the seller
> is in Australia, but even so....)
> 
> Help....anybody....
> 
> fairy.  (I feel much more comfortable now that I have "come out"...hehe)
> 
> -
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