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What is the diff. between an apochromatic, achromatic and regular barlow lens?

April 26, 2017accessories achromatic apochromatic barlow diff eyepieces Lens regular telescope telescopes

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What is the diff. between an apochromatic, achromatic and regular barlow lens?

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An achromatic lens usually consists of two elements. The different wavelengths of light do not meet at the same focus point, causing chromatic aberration. An apochromatic lens uses 3 or more elements. The different wavelengths meet at the same point of focus, effectively eliminating chromatic aberration.