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Possible Duplicate:
What is the difference between EF and EF-S lenses?

I read here:

EF: Electronic Focus

EF-S: Short-Back Electronic Focus

Is the difference significant? How much will it matter in practical?


Background:

I am trying to choose between the Canon EOS Rebel T2i options available on internet.

Amazon and B&H are way costly as compared to this Adorama deal, but it says

... with EF 18-135mm f/3.5-5.6 IS Image Stabilized Lens