Does my crop sensor camera actually turn my lenses into a longer focal length?
If I have an EF-S lens with a focal length of 10mm on an APS-C camera (i.e. with sensor crop factor of 1.6x) does it mean that the focal length becomes 16mm? Or since an EF-S lens can ONLY (without any tweaking of lens/camera) be attached to an APS-C Camera, is the focal length really still 10mm?
If 10mm in lens = 16mm in Camera, why specify a 35mm equivalent on the lens since it can only be used on APS-C Cameras?