Originally Posted by MrFatbooty
Er that's what I meant, I just put in the wrong aperture and called it "EF-S" since that's what DiII means.
h:
If you are talking about Tamrons DiII system being their equivelent to Canons EF-S system then that is incorrect.
The EF-S system satnds for Electronic Focus Short. This is how it works.They are able to make a lens that goes further into the body because Canon digital bodies are of course not a full frame 35mm sensor. If you were to mount an ef-s lens to a 35mm film body the mirror would hit the glass of the lens and damage one or the other. To make sure no one used such a lens in a full frame body they made a different mount called the ef-s. Unfortunalty the EF-s lens technology wasn't made untill after production of the 10d so the 10d doesn't accept EF-s mount lenses.