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Old 11-10-2006, 11:53 AM
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RB (Andrew)
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Bert is absolutely right that's what makes the 300mm f/2.8 lens (and up) so special, they really are in a class of there own.
The only other L series lens which has one fluorite element is the EF 100-400mm IS telephoto.

The rest of the L series, as stated, use UD lenses which minimise but not completely eliminate CA dispersion.
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