Thanks to everybody who replied to my questions!.. I've choose to keep the
lens and seller agreed to refund significant part of money I've paid ;-)
At the same time I tried to fix it: I removed the rubber sleeve on
zoom/focus collar and put a few drops of oil somewhere on rotating joint,
visible through rides for nylon washers (it's hard to explain with my
English where exactly, but my mechanical engineer's scent guided me ;-) and
then spent some time (near 2 hours!) turning focusing collar back and
forward, periodically reapplying lubrication... I can't say it is smooth as
new now but definitely not so stiff as was before...
I made some shorts already and must say that optically it's really
excellent lens! It's first Pentax lens I have whose bokeh is really pleasing
to me! I have SMC-A 50mm F2, SMC-M 135mm F3.5 and A 28-80mm F3.5-4.5
(non-SMC) zoom plus Super A(Program) body. I used 135mm for portraiture but
it's bokeh is good (not nice!) or wide open or beyond F5.6 + 1/2 = F6.7 when
aperture blades start to form opening without harsh corners... SMC-A 70-210
F4 zoom has, it seems, very good to nice bokeh almost at all aperture values
despite it's opening becomes near round at F8 and beyond (maybe because of
far more complicated optical formulation (14-13) the shape of aperture
blades opening doesn't affect bokeh so much?).
Ok, good shooting to all our Pentax community ;-)
Good-bye, Vlad.
----- Original Message -----
From: "Vlad L. Loukiantchenko" <[EMAIL PROTECTED]>
To: "Pentax Mailing List" <[EMAIL PROTECTED]>
Sent: Monday, April 30, 2001 16:15
Subject: My "new" stiff zoom...
> Hi, All!
>
> I've just got the famous Pentax SMC 70-210 F4 zoom I've bid on eBay. It
> looks good enough optically and cosmetically but has pretty stiff focusing
> especially on 70mm zoom position near short range. Of course the zoom
action
> is little loose also ;-) Is it possible to do something (lubricate) with
> this, preferably by myself (suppose I have enough skills in such kind of
> things repair). Maybe somebody tried to perform such task and know what to
> do?
>
> PS
> Definitely the seller didn't describe nothing about it: "sooo clean
> optically and physically". I'm trying to communicate with him on this
> issue... Maybe you know how much such service will be cost?
>
> Thanks in advance and happy shooting, Vlad
>
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