05-21-2021 03:47 PM
I believe the DC name is Sigma’s note for crop sensor cameras. DN is for mirrorless.
I can’t remember mounting a DC on my FF body so I don’t know if it will.
Canon uses a red dot for EF lens mounts, and a white square for EF-S lens mounts. Sigma uses neither. Sigma uses a white dot that aligns with Canon's red dot on a camera body. All of their lenses are made this way.
05-21-2021 03:51 PM - edited 05-21-2021 03:52 PM
Sigma 18-200mm. Notice the white dot, which aligns with the Canon red dot.
Why spend the extra money to make two diffferent mounts, when using just one gets the job done?
05-21-2021 05:14 PM
"Why spend the extra money to make two diffferent mounts, when using just one gets the job done?"
Perhaps so, however, Sigma does indicate which camera model their lenses are designed for. DG is for full frame while DC is for the cropper series. DN is their new designation for mirrorless. Example my 120-300mm F2.8 DG OS HSM Sport is designed as a FF lens. Indicated by the "DG" in its name. Although it will mount on a cropper and perform flawlessly.
I have not, or at least I can't ever remember doing so, mounted a DC lens on any of my FF cameras. I would hope that people would realize it is not the best idea and specifically why Sigma makes the name different for each line. I actually don't ever think I have owned any EF-S/DC lenses at all. I have used a very few but I don't remember owning any. They are just not built well enough to satisfy my requirements.
05-21-2021 08:37 PM
Only Canon lenses have an EF-S mount. All third party lenses use the EF mount, but if they are designed for the APS-C bodies they will usually vignette at the wider focal lengths.