If a lens is designated by manufacturer as "designed for crop sensor" (i.e. DC in Sigma, DX in Nikon, DT in Sony), how would that affect the calculation of practical focal length (equivalent focal length for a full frame sensor)?
For example, if I were to purchase a 50mm lens designed for a crop sensor camera, would that given/advertised focal length already be adjusted for the size of the crop sensor, or would I still multiply by 1.5 (so that the 50mm design for crop sensor lens is actually effectively 50*1.5=75mm) to get the effective focal length?
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