Sigma for Nikon 400mm f/5.6. Can I convert to Canon?

[HiFiGuy1]

Well, I've seen some of your shots, and you're obviously capable of handling the manual lens. At my current skill level, I need the crutch of AF, but I am trying to get better every day.

[Fast Glass]

Well, I've seen some of your shots, and you're obviously capable of handling the manual lens. At my current skill level, I need the crutch of AF, but I am trying to get better every day.
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Yeah, you shouldofseen my recycle bin when I first got my manual lens!