Originally Posted by Elijahtc

full body sensor is a full frame sensor meaning the image sensor is the same size as a 35mm negative. A smaller size image sensor is far smaller in comparison so it cuts down on how much of the picture is actually seen through the lens.

Basically draw a 35mm square and inside that square draw one like 25mm. The 25mm square is what the smaller image sensors see.

So with a full frame sensor, when u use a 28mm lens u actually get 28mm.

WIth the smaller sensor a 50mm turns into an 80mm lens cause of the smaller sensor. the crop is like 1.63x i think. So any focal length u use, multiply it by 1.63 and that is the real focal length u will be shooting at. That is the reason for the "digital" lenses (ef-s). They are engineered to compensate for the smaller image sensor, so that u can actually use wide focal lengths.


Understand now?

Originally Posted by Elijahtc

That is the reason for the "digital" lenses (ef-s). They are engineered to compensate for the smaller image sensor, so that u can actually use wide focal lengths.

Originally Posted by miketf1

very well put.. that is also why the full frame canon's are not compatible with the EF-S mount cause they just cannot focus at such short focal lengths