Canon EF-S lens focal length on APS-C Body?

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kbdkbd
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Canon EF-S lens focal length on APS-C Body?
9 months ago

Can someone please explain the resultant focal length of a Canon EF-S lens on an APS-C body such as Rebel t4i?

I think I know that to figure out the resultant focal length of an EF lens on an APS-C would be to multiply by 1.6 so for instance a 50mm EF would be 80mm equiv focal length on APS-C.

I thought that if I used an EF-S lens on the t4i designated as let's say 18-135mm that it would give a resultant image equiv to 18mm on the wide end and 135mm on the tele end. But what I have read lately seems to indicate that this is not the case.

I would like to steer away from EF-S for the eventual move to full frame, but it seems difficult to get wide angle zooms (starting in 10-15mm wide) from EF type lenses (also taking into consideration non-Canon) on an APS-C body. Now I'm thinking even if I do get an EF-S 10-22mm that I'm still not getting 10-22mm but rather 16-35.2mm on the APS-C body.

This is very confusing.

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