At 4:47 PM -0500 10/14/02, clintonr@xxxxxxxxxxxxxxxx wrote:
>Fargo sells some lens cement that cures with UV (otherwise called "sunlight"!
>;^). Check a hardware store -- it comes in a red syringe, marked "Duro
>Crystal Clear"!
>
>We just soak the element in acetone, clean off all the old cement, put a
>(bubble free) drop on the center of the concave element and press the convex
>element onto it, squeezing out the excess cement. Clamp with locking tweezers
>with pads on the legs, put in a window for a day, and presto! Works great,
>been doing it for years now!
>
>John Hermanson wrote:
>
> > What do you re-cement the elements with?
Norland makes UV-cure lens cement, line their "Optical Adhesive 60", guaranteed
not to yellow. Edmund sells it. It sounds like this Duro Crystal Clear is
much the same stuff, though I haven't seen it. I used to set the lens on a
ring so the lens was horizontal, and the upper element wouldn't tend to creep.
Real industrial users use a high-powered UV source to stiffen the cement in
five or ten seconds, full cure in five minutes.
<http://www.norlandprod.com/adhesives/noa60.html>
See <http://people.smu.edu/rmonagha/mf/lenscement.html> for advice on
recementing lenses from the Rollei folk, also keepers of ancient flames.
Joe Gwinn
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