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An ED doublet will reduce chromatic abberation very well for visual, but for digital photography the camera has extra sensitivity at wavelengths the eye can't see. Since they don't implicitly state FPL-53 (not that the glass type alone makes a refractor, but it does play an important part) I would assume it is based on an FPL-51 design. To remove CA an FPL-53 doublet, or an FPL-51 (or better) triplet will be better suited.
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