At 18:37 4.2.2001 -0800, you wrote:
>I have a 100mm Macro f/4.0 which has a problem. The problem looks like a
>fungus on the front element, but three different repair shops said it is
>not fungus. Pentax-Colorado did not say what the problem is, but they
>say it is not repairable due to lack of parts. One local repair person,
>who is much trusted with a strong reputation, said that the two lens
>elements in the front group are just barely seperating and that that is
>what is causing the faint hazy effect.
>
>In any case, the concensus is that I need to replace the front group. A
>trivial repair, I could do it myself in 5 minutes if I had the part.
>Anybody out there know where I might find one? Anyone with a "trashed"
>100mm f/4.0 which still has the front intact?
>
>Stan
Stan, I had similar thing: what I thought was either fungus or oil on the
lens turned out to be a mild separation of two cemented elements. The
repairman I send it to for general cleaning repaired even this! But if you
are *really* in a pitch, you could try to separate them completely and
recement them yourself. Rmonagha's site (www.smu.edu/~rmonagha/ ???) gives
AFAIK some info. AFAIK the 4/100mm is a simple Tessar formula, so it
shouldn't be too difficult to remove front element, no? But I suggest this
as a LAST resort. God knows what cement Pentax used for cementing
(certainly not Canadian balsam!), and you might even crack your lens group
if you do it by force. Or the chemical you might use to solutize the cement
might peel off the SMC ;)
Frantisek (trying to cope with lens repair by trying on old cheapio
enlarger lenses... Anyone wants to buy sixty three diaphragm leaves from
several Meopta Belars ;-?
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