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Posted by Robert May on May 11, 2001 22:43:02 UTC

A marketing term for a scope that is a bit better than a regular acromatic scope.
The various glasses that can be used for a refractor varies from very poor combinations to very good combinations that produce excellent color control. The unfortunate thing is that the better the glass is for the job, the worse the price becomes due to the cost of making the strange glasses. Quantity has nothing to do with it as the strange glasses are all glasses that are difficult to get mixed right and melted properly.

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