Jason C Doss said:
Nill, this is an f/2.8 constant aperture 50-150 DC lens for 1.5x sensors. Even though I've never used a 1D, I've always been curious to know how these DC lenses work with 1.3x sensors.
Apparently the Sigma DC lenses won't work with 1.3x sensors. Several of Sigma's Web pages talk about the "DC" lenses working with cameras with APC-C size sensors, which excludes the 1D series. For example, Sigma's
Lens Chart Web page says in a footnote, "DC lenses: ... An image sensor element larger than than those corresponding to APS-C cannot be used in digital cameras or 35mm film cameras. If such an element is used vignetting will occur for digital cameras."
I've read that the mirror will hit the back of Canon's EF-S mount lenses if the lens is mounted on cameras with sensors larger than APS-C.
Bob