Hi Olafo:
Can Jaap be bothered to fix one element of a Sigma 600 F 8 lens that is
afflicted with Haze? I have had the element dismounted by a local technician
and would easily be able to send it out in a small pack.
Regards
Titoy
----- Original Message -----
From: Olaf Greve <olaf_greve@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Cc: <erwin.voogt@xxxxxx>; <j.korten@xxxxxxxxxxxxx>; <Johnsonpa@xxxxxxx>;
<bphuber@xxxxxxxxxx>; <cnocbui@xxxxxxxxx>; <o.greve@xxxxxxx>
Sent: Tuesday, March 13, 2001 5:32 PM
Subject: [OM] An update on the condition of my sick lenses and a request for
some advice.
> Hi,
>
> Many of you will probably still remember that my 300/4.5, which I obtained
> for little money thanks to Brian Huber, was sick. In fact, it previously
> only suffered from two tiny fungus specks, but in a caring attempt by
yours
> truly to cure the patient, I actually made the situation worse. Indeed, I
> managed to damage the second element when counted from the front, and I
also
> found that even in a bathroom, it's virtually impossible to prevent dust
> from entering the lens. To make matters worse, I could not reach the
fungus,
> and the two halves of the lens have been glued together (probably the lens
> has been cleaned before by a previous owner, who then dumped the lens
after
> seeing the fungus re-appear?!?). Anyway, I inquired about the
possibilities
> for dissolving the glue that holds the two halves together and aceton was
> mentioned. In the end, I decided that I'd probably better not try this
> myself (to not further damage the lens), and I decided to leave the lens
> as-is. I took several pictures with the lens and neither the fungus, nor
the
> damage on the inner element seems to visibly deteriorate the image
quality.
> Nonetheless, it kept bugging me that the element was damaged, and when I
> obtained the "NC" (= No Coating :) ) 28/2, I decided that when looking for
a
> replacement element for this lens, I was also going to look for a
> replacement element for the 300/4.5.
>
> So, the quest for elements was on, and enter Patrick Johnson. Patrick very
> kindly helped me in obtaining these elements from Oly America. A second
28/2
> element has been back-ordered for some 8 months now, so we finally decided
> to have the available elements shipped to Jaap Korten, so he could repair
my
> lenses already. Happy news: I just learned from Jaap that the 300/4.5 has
> been repaired and is alive and well! I still have to send the 28/2 (which
> I'll probably do tomorrow), and then that one can be repaired too. I'm
> excited already to see the return of the 300/4.5 and the 28/2.
>
> Good, so far for the update on my sick lenses, but now a few small
> questions. I'm a bit worried about the still present fungus inside the
> 300/4.5. At present it doesn't seem to grow (at least not visibly) and no
> image degradation seems to occur because of it. Nonetheless I wonder if
> there are ways to stop its further growth. I checked with Jaap and in his
> opinion it may be better to leave the lens as-is, rather than attempting a
> risky aceton-manouvre. I tend to agree on this, but I wonder if there are
> *completely safe* ways to kill the fungus without doing any damage to the
> rest of the lens. From previous threads on the subject, I've gathered that
> exposing the lens to strong UV light kills off the fungus, hence
preventing
> further growth. Now, for the questions:
> 1) Can anyone tell me whether exposing the lens to (strong) UV light will
> absolutely not damage any other parts (such as coating) of the lens?
> 2) Will a regular "blacklight TL" bar provide the correct type of UV light
> (I'm aware of the fact that there is both UV-A and UV-B radiation in sun
> light, but I'm not certain which type(s) the blacklight emits, nor which
> type I should use to kill the fungus)?
> 3) If a regular blacklight will do the trick: how long should I more or
less
> expose the lens to it?
>
> Good, I hope someone can help me out here, and Brian: "our" 300/4.5 is
> apparently doing much better already! :)
>
> Finally, I'd like to take the opportunity to give a big "thank you" to
three
> people:
> 1) Brian Huber: for his help in getting the 300/4.5 for an excellent price
> for me, instead of keeping it himself.
> 2) Patrick Johnson: for all his help in getting the elements from Oly
> America, as well as for the excellent packaging and shipping of the
> elements.
> 3) Jaap Korten: for numerous things, but particularly in this case for
> curing my sick lenses.
>
> I just wanted to share this good news with you guys. Now, from the
> Zuiko-sick-bay, this was Olaf Greve, over and out. :)
>
> Cheers!
> Olafo
>
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