SLR full lens and half of the difference between the lens?
EF series is designed for high-quality full-frame camera design and manufacturing, image quality is much better, can also be used for APS-C frame camera, but with the middle of the imaging part.
The EF-S series lens is specifically designed and manufactured for APS-C frame camera photographic components, and can not be used on full-frame cameras, otherwise it will damage the reflector.
Canon lens points EF series (full frame), EF-S series (APS-C is the so-called half-frame) two series.
The two series of lenses used in the APS-C frame camera, because the size of the photosensitive components, to multiply the 1.6 coefficient is equal to the full-frame camera perspective.
In general, the two can not be seen from the outside. But there will be differences in the lens parameters.
The fundamental difference between the two is: because the full-frame photosensitive components than aps frame (so-called half) of the size of the sensor more than doubled, the former is 36mm * 24mm, the latter only 24mm * 16mm. Therefore, full-frame lens imaging circle than aps frame lens much larger. Because of this difference, so full-frame lens can be used in aps frame camera, and the effect is very good (only the best part of the lens imaging of the middle). On the contrary, aps frame lens, if used in full-frame camera, it is likely to produce the phenomenon of black circles (zoom lens may have some focal lengths do not produce black circles), so not only lost the wide-angle screen, and edge imaging quality Also very poor
