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Old Jun 21, 2005, 7:54 AM   #1
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I've seen it many times lately but I can't find an explanation of what it means. What is meant by the term 'L Glass' in regards to lenses?

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Jim White
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Old Jun 21, 2005, 7:57 AM   #2
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Jim,

L Glass refers to Canon's professional line of lenses - I believe the L stands for luxury. In general you are gauranteed superb build quality and very good to excellent optics. Most manufacturers have a similar line - for Sigma it's their EX line.


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Old Jun 21, 2005, 8:01 AM   #3
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Thanks! I tried to make something too technicalof it. I understand the EX reference to Sigma. Just didn't relate that to Canon's line of lenses.

Jim
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Old Jun 21, 2005, 11:04 AM   #4
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Yes, the L(canon) or EX(sigma) or SP(tamron) or ED(nikon) lines tend to have one or usually more elements in them made of special rare earth low dispersion glass. Which makes them perform much better optically than normal lenses. They also tend to be much better built.

Now they have all added another monicker DO(canon) DG(sigma) XR-DI(tamron). To indicate lenses oprimized for digital. Canons DO(Difractive Optics) is most interesting but also expensive :-). Their EF70-300 F4-F5.6 DO IS, is very small and light weight, but I've heard performs very well for its 1700$cdn(ouch, you can get a 70-200 F2.8 L for that) price tag.

Peter.

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