In a message dated 8/12/2003 8:27:19 AM Eastern Daylight Time,
om@xxxxxxxxxxxxxxxx writes:
> I've talked to three persons who have had their focus points go off,
> preventing them from focusing at infinity. Greg Logidice was the last person
> who had this problem, he's still on the list. Admittedly, this is a very
> small sample and has NO basis for representing the larger population....but
> it is
> strange.
>
> skip
Hi folks,
The problem with my Tamron was that it could not focus to infinity. Tamron USA
said the internal focus helicoid had been damaged by impact and they replaced
it for about $300 (ouch). The lens is otherwise in excellent condition
otherwise, so I figured it was worth it.
Regarding the impact damage, the only evidence of such damage was an
indentation on the underside of the metal barrel that could likely have been
the result of a sharp blow. I saw the indentation when I purchased the lens,
(used) but seeing nothing else obviously wrong with the lens, thought nothing
more of it. I never noticed the infinity focus problem myself because I
usually used it as a long macro lens. Skip actually noticed it while he had
the lens on loan from me.
It could be that the lens is somewhat fragile. But then again, it is all metal
- heavy and robust - and seems to be built along the same lines as the larger
300/2.8, of which I haven't heard of any such problems. I'm not sure if a lot
of other lenses could withstand the blow my lens evidently took without some
internal damage.
Nonetheless, it's fixed now and in top condition. It does focus much, much
smoother now, and is a joy to use. Here's an example of a recent shot
(although clearly not at infinity)
http://www.gplphotography.com/Up%20Close%20Sub%20Pages/Desert%20Bloom.htm
It is curious that we have seen several of these lenses now that may have had
problems. That said, I wouldn't let that fact dissuade me from purchasing it.
Rather the opposite - having been warned, I would know exactly what to check
for. As long as the lens passes this inspection, be assured that it is a
keeper - very sharp, bright, and contrasty. Probably the best 180 this side of
the Zuiko 180/2.0.
Hope this helps,
Greg Logiodice
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