What is the advantage of Canon EF-S lenses over EF?

Question

I know EF-S lenses are designed for certain Canon cameras (XT up to 40D), but what is the advantage of them? I was originally made to understand that the EF-S lenses took into account the 1.6x crop factor so that the EF-S 17mm-85mm was indeed effectively a 17mm-85mm equivalent and not effectively 27mm-136mm. The more I read, the more I'm beginning to feel that this is not the case. If this is not the case, then why would I want an EF-S lens as opposed to the more widely compatible EF lenses?

manduley · Answer

in ordinary terms the whole Framed Canon DSLR's in ordinary terms use EF lenses. And, in case you do no longer plan on going to complete physique interior the close to destiny, there is no subject in procuring EF-S lenses. some lenses are in ordinary terms available as EF-S lenses, so in case you want it, you're patently going to ought to get it. think of, once you get the 5d ( in case you do ) you have the XSI as a backup, and you will nonetheless use the EF-S lenses. the main costly Canon lenses are frequently EF, besides. in case you have become a severe-grade it is going to likely be an EF type. in case you spot an EF-S lens which you like, get it. EF lenses are not greater ideal than EF-S lenses with the help of any ability! with the help of all ability, get the EF-S lens in case you want it. once you visit complete-physique you will purely ought to get different lenses.

Pooky™ · Answer

Fhoto is correct. A friend and I took apart his kit lens (after I gave him the 17-35 mm f 4 L zoom to replace it)--because we wanted to see what was inside. And it was tiny. It was not design to cover the full frame 135 mm format--and indeed, I don't think the largest element we saw was half the size of a dime. 

On the other hand, I look through my 135 mm f 2 lens (didn't take it apart!!) and it's huge.

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What is the advantage of Canon EF-S lenses over EF?

2 Answers