Difference between revisions of "Cooke triplet"

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(Created page with "The Cooke triplet was the first lens which was quite well color corrected for two colors (achromatic lens) and also corrected against astigmatism, patented in 1893 by ...")
 
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The [[Cooke]] triplet was the first lens which was quite well color corrected for two colors (achromatic lens) and also corrected against [[astigmatism]], patented in 1893 by Dennis Cooke. The only later basic efforts made in lens history were the correction for three colors (apochromatic lens) and the [[coating]] against flares.
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The [[Cooke]] triplet was the first lens which was quite well color corrected for two colors ([[achromat]]ic lens) and also corrected against astigmatism ([[anastigmat]]), patented in 1893 by Dennis Cooke. The only later basic efforts made in lens history were the correction for three colors (apochromatic lens) and the [[lens#coatin|coating]] against flares.
  
 
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Revision as of 14:52, 9 September 2012

The Cooke triplet was the first lens which was quite well color corrected for two colors (achromatic lens) and also corrected against astigmatism (anastigmat), patented in 1893 by Dennis Cooke. The only later basic efforts made in lens history were the correction for three colors (apochromatic lens) and the coating against flares.

385828283_ebdd8d9724_o.jpg
The combination of two convex lens elements made of crown glass with a concave

one which is made of flint glass is known since 1765 as a means against chromatic
aberration. Achromatic lenses enable well focused projection of blue and green
light. The draft exaggerates the different optical paths of the blue and
the green light shares of the light coming from a blue/green (cyan) light mixture.
The Cooke triplet was derived from this simple triplet lens construction.

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