I have the 18-55mm kit lens for my Canon 50D and was wondering if they're still specified against full frame 1:1 crop? Would my 18mm actually be 1.6x?
I ask because I doubt anyone with a full frame camera would even think of using a kit lens of this calibre.
Answer
18-55mm is the focal length, which is independent of sensor size.
Your lens is made for APS-C, so the any field of view measurements are likely for APS-C. It would be the equivalent field of view of a 28.8mm-88mm, which we refer to as 28.8e-88e.
On a full-frame camera, it will vignette.
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