Lens Elements and Groups?

Discussion in 'Lenses and Accessories' started by Wail, Nov 10, 2006.

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  1. Wail

    Wail Well-Known Member

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    OK, when looking to buy a lens it always mentions things like x number of elements, and y number of groups. What are these elements and groups; how do they make a lens any better worse?

    Anyone has any help on this would be appreciated.
     
  2. Ben Stafford

    Ben Stafford Site Admin

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    Simply, an "element" is a single piece of glass and a "group" is one or more elements grouped together.

    There are too many other factors involved to definitively say that x elements in y groups is better than A elements in B groups. You have lens/glass quality, quality of lens barrel, diameter of the lens, sensor quality and so on.

    This link has a couple paragraphs about lenses: http://johnlind.tripod.com/science/sciencelens.html
     
  3. Wail

    Wail Well-Known Member

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    As always, you come to the rescue with a good and succinct answer. Thank you Ben.

    As for the article you’ve linked, very useful.
     
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