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Frequently Asked Questions

Negative Achromats consist of two optical components, a crown and a flint glass lens, cemented together.

Negative Achromats are used predominantly to extend focal lengths in combination with positive achromatic systems or CCD lenses.

The diameter range for Negative Achromats is 6.00-25.00 and 25.01-50.00.

The tolerance for centering irregularity is less than 3 minutes.

The coating for Negative Achromats is 1/4wave MgF2 @ 550nm (See Coating Chart for Available Options).

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