Fogged lens problem
 

I have an old (1969) Elmo FP-C super8 movie projector with a fogged lens. It is
the first lens in the zoom lens. I can get at it but can't unscrew it to get to
the fogged side. I've tried numerous repair places and clubs here in OZ but
nobody touches these things anymore.
If somebody could give me a clue or suggest a more appropriate group I would
appreciate it.
Thank you

Gordon

Fogged lens problem
 

On Fri, 28 Dec 2007 02:38:01 GMT, "Gordon W" wrote:

|I have an old (1969) Elmo FP-C super8 movie projector with a fogged lens. It is
|the first lens in the zoom lens. I can get at it but can't unscrew it to get to
|the fogged side. I've tried numerous repair places and clubs here in OZ but
|nobody touches these things anymore.
|If somebody could give me a clue or suggest a more appropriate group I would
|appreciate it.
|Thank you
|
|Gordon

If the lens is fogged, it's most likely the melted glue that holds
the plastic or glass lens, of which some usually chips off to little parts
at the bottom of the "lens tube"

If it's a chrystaline/granulated lens, it's just an old or cheap
lens....irreperable

In either case, it seems you'll have to replace the lens, unless
your magical formula can save it otherwise....if it works, please keep us
posted...
--
Triad Productions-Fantalla®(tm)~EZine~ParaNovel
http://tarbitch.balder.prohosting. com
mirror http://triad.beam. at

Fogged lens problem
 

Bob writes:

On Fri, 28 Dec 2007 02:38:01 GMT, "Gordon W" wrote:

|I have an old (1969) Elmo FP-C super8 movie projector with a fogged lens. It is
|the first lens in the zoom lens. I can get at it but can't unscrew it to get to
|the fogged side. I've tried numerous repair places and clubs here in OZ but
|nobody touches these things anymore.
|If somebody could give me a clue or suggest a more appropriate group I would
|appreciate it.
|Thank you
|
|Gordon

If the lens is fogged, it's most likely the melted glue that holds
the plastic or glass lens, of which some usually chips off to little parts
at the bottom of the "lens tube"

If it's a chrystaline/granulated lens, it's just an old or cheap
lens....irreperable

In either case, it seems you'll have to replace the lens, unless
your magical formula can save it otherwise....if it works, please keep us
posted...

Most expedient solution is probably to get a replacement on eBay!

It may indeed be that the lens surface or AR coating has degraded
and there is no way to easily repair that. But there are plenty of
these projectors or just the lenses out there if you want to restore
yours.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
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Triad Productions-Fantalla®(tm)~EZine~ParaNovel
http://tarbitch.balder.prohosting. com
mirror http://triad.beam. at

Fogged lens problem
 

In the grand scheme of things a '69 lens is not all that old.
I have seen, however, fungal fogging in younger lenses.
On the front lens it is usually not too difficult to get
at, usually. I am not sure why you can't get at it.
Do you have a lens 'spanner'? This is a gadget that fits
into the slots at the sides of the retaining ring holding it in place.

If there is a dress ring in front of the retaining ring you will
have to screw it out first with a rubber ring and block of (say)
wood, or whatever. After this all is straightforward. It's a
friction fit.

I use an old pair of fine scissors to screw out the ring - CAREFULLY!
Don't slip and scratch the lens! Adjust the points to fit the slots and
hold it firm and twist.

The fog may just wash off with alcohol (Metho) and a blast
of canned gas (DSE). If it is fungus, google a cure - I believe
household ammonia works OK but you're on your own there!

Zoom lenses are a bit of a headache. I've got one with the
same symptoms but it is the 3rd layer down and I'm unable
to go that deep. I sympathise. Complete dissasembly is
a job for experts and not one for the tyro.

See how you go.
Murray
Brisbane




Gordon W wrote:

I have an old (1969) Elmo FP-C super8 movie projector with a fogged lens. It is
the first lens in the zoom lens. I can get at it but can't unscrew it to get to
the fogged side. I've tried numerous repair places and clubs here in OZ but
nobody touches these things anymore.
If somebody could give me a clue or suggest a more appropriate group I would
appreciate it.
Thank you

Gordon