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to add to chuckles excelent post
the EX is a sigma code, it represents their ' professional ' range of lenses, similar to the Nikon DX code
The DG is Sigma's new coated glass for the latest digital SLR camera's, it helps with sensors ' shiny ' surface ??
a G lens is a good lens, but at the bottom of the range in quality and features,
the ED glass is better and usually brighter
you usually find these codes mutate as lenses and technology develops, the next code representing a newer/better ( ? ) lens than the last version,
however , all the different levels of lenses are still available from new,mostly
hope this helps a little
MyPix ( also has a D70 )
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Its not the camera that takes a good pic ;o)
But i use a Nikon
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