Sigma DC lenses for Canon DSLRs
Sigma’s range of DC lenses are designed for DSLRs with smaller 'cropped-frame' sensors. DC lens optics are only corrected for use on these bodies and are not compatible with 'APS-H' or full-frame models.
Like all lenses, you’ll still need to take your DSLR’s field reduction factor into account. Since DC lenses are only designed for use on APS-C bodies, the reduction factor will be 1.6 times for every Canon model. So the general-purpose DC 18-50mm lens will deliver a field of view equivalent to a 29-80mm.
For a full explanation of lens specifications and examples of coverage at different focal lengths, check out our Camera Labs Lens Buyers Guide.