Difference between Sigma EX DG Macro 105 mm and Sigma EX Macro 105 mm

[pravinxp]

HI Guys i am confused between these two lens. What is the difference between these DG and non DG version lens ?

[rajib]

Sigma DC lenses are Crop-factor lenses meant for use on popular DSLR cameras.
Sigma DG lenses are Full-frame lenses that are also compatible with DSLRs.

Sigma EX is additional branding to represent higher quality of product - better optics, better electronics, better build quality/finish.

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http://www.sigmaphoto.com/faq-lens
http://en.wikipedia.org/wiki/Sigma_Corporation#Designations