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
