EF-S lens

13 years 3 months ago #20556 by Djradio
I heard that if you put an EF lens on a APS-C the focal length isn't "true" to what it says on the lens. So, on an EF-S lens does the same apply? Or does it stay "true" to the markings on the lens?


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13 years 3 months ago - 13 years 3 months ago #20558 by vipergts831

Djradio wrote: I heard that if you put an EF lens on a APS-C the focal length isn't "true" to what it says on the lens. So, on an EF-S lens does the same apply? Or does it stay "true" to the markings on the lens?


This seriously depends on who you talk to. Some people say a lens focul length is the same regardless. Others speak to the crop factor. Example: a 50mm lens on full frame (1:1) is a true 50mm. However, on a crop sensor (1:1.6, APS-H 1:1.3) who has a crop factor of 1.6 (if speaking only about APS-C as you mentioned) it becomes 80mm (focul length * crop factor, in this example 50 * 1.6). Thats what your running into in talks about "true" lengths. All this is saying is the following. In order to get the same field of view (FOV) that someone on FF is getting with a 50mm lens you would have to be at 80mm on crop. Thats what all these discussions are about.

This is also the same reason why sports photographers use crop cameras because of the extra reach they provide on the lenses they use. A 70-200 2.8 on an ASP-H crop sensor becomes the FF equivalent of 91-260. Same came be done for all the other lenses they might use.


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13 years 3 months ago - 13 years 3 months ago #20560 by Solstar
You heard right, you still have to apply the focal length multiplier even though EF-S lenses only work crop sensors. EX: My 10-22 is equivalent to about 16-35 (or roughly the same focal length as the 16-35 L-Series lens).


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13 years 3 months ago #20588 by Djradio
Thank you guys.


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