"rander3127" wrote in message
...


So does the extra $4000 account for the cost of the fluorite compared
to FPL-53 or is the fluorite that much harder to work?


Both. Mostly the cost of the fluorite itself, but there is also more work
involved.

I'm not sure, but I believe the crowns used to work with a fluorite element
are also somewhat more expensive than those typically used for FPL-53.

John.