Effects of using EF in EF-S camera and lens crop factor calculations.

I have read a lot about APS-C sensors and the differences between EF and EF-S lenses.
I still have two remaining questions regarding how EF-S lenses are marketed.
1) Do EF-S lenses need to have the 1.6x factor applied for effective focal length or are they marked correctly since they can only be used in APS-C cameras?
E.G. My 17-40mm EF 4L lens is effectively a 27.2-64mm when used in a EF-S mount camera due to the 1.6x factor.
So would a 60mm EF-S prime lens actually be similar to a 60mm EF prime lens in terms of focal and "zoomed" level of the image? Or would it also apply the crop factor and be effectively a 96mm focal length?
2) Are there any other attributes of an EF lens that you must apply a conversion when using in an EF-S mount? F-stop rating?
Thank you in advance for any guidance you provide!!
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techjedi wrote:
I have read a lot about APS-C sensors and the differences between EF and EF-S lenses.
I still have two remaining questions regarding how EF-S lenses are marketed.
1) Do EF-S lenses need to have the 1.6x factor applied for effective focal length or are they marked correctly since they can only be used in APS-C cameras?
E.G. My 17-40mm EF 4L lens is effectively a 27.2-64mm when used in a EF-S mount camera due to the 1.6x factor.
So would a 60mm EF-S prime lens actually be similar to a 60mm EF prime lens in terms of focal and "zoomed" level of the image? Or would it also apply the crop factor and be effectively a 96mm focal length?
2) Are there any other attributes of an EF lens that you must apply a conversion when using in an EF-S mount? F-stop rating?
Thank you in advance for any guidance you provide!!
If you feel obliged to think in full-frame terms even when using an APS-C camera, then yes, the crop factor is applied equally to zooms and primes. But unless you routinely use both types of camera, the mental exercise is really rather silly. Better to simply get used to the idea that on an APS-C camera a 30mm lens is "normal"; a 50mm lens is a mild telephoto or portrait lens; a 17-55mm zoom is a typical "walking around" lens; etc. Once you start thinking in those terms, you're much less likely to select the wrong lens than if you have to constantly apply the correction factor. If you do use both APS-C and FF cameras, you'll quickly get used to selecting, for example, the right normal lens for either type of camera, because you already know, in each case, what that is. At least that's what I've found to be true.
Bob
Boston, Massachusetts USA

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